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HTML

<!DOCTYPE html><html lang="en-US"><head>
<title>W3Schools Online Web Tutorials</title>
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<meta name="Description" content="Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.">
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var subjectFolder = location.pathname;
subjectFolder = subjectFolder.replace("/", "");
if (subjectFolder.startsWith("python/") == true ) {
  if (subjectFolder.includes("/numpy/") == true ) {
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  } else if (subjectFolder.includes("/pandas/") == true ) {
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}
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<script src="/lib/user-session.js?v=1.0.34"></script>
<script src="/lib/my-learning/main.js?v=1.0.29"></script>


<style>
/* Customize w3schools23.css */
#nav_tutorials,
#nav_references,
#nav_exercises {
  margin-top: 0;
}

@media screen and (min-width: 769px) {
  .w3-bar-block .w3-button {
    padding: 0 16px !important;
  }
}
#belowtopnav {
 padding:0;
}


#main {
  padding: 0;
  border-right: none;
  width:100%;
  margin-top:88px; 
}

#mypagediv2,#user-profile-bottom-wrapper {
  height:0px; overflow:hidden;display:block;
}
#footer {
  padding:0;
}

.herosection {
  background-image:url('/images/lynx_in_space.webp'), url('/images/background_in_space.webp');
  background-repeat: no-repeat, repeat ;
  background-position: 90% 60%, center center /*left  top*/;
  padding-top:90px;
  padding-bottom:90px;
}

@media screen and (max-width: 992px) {
  .herosection {
    background-image:url('/images/background_in_space.webp');
    background-position:center center /*left top*/;
  }
}


/* Customize W3.CSS */
.w3-col.l4 .w3-card-2 {
  padding: 15px 10px;
  height: 260px;
}


h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Source Sans Pro', sans-serif;
}

h1 {
  font-size: 80px;
  margin: 2px 0 -20px 0 !important;
}

.learn h1  {
  margin: 10px 0 !important;
}


.green-border {
  border-left: 4px solid #04AA6D;
}

.w3-round, .w3-round-medium {
  border-radius: 5px;
}

.tryit-button {
  background-color: #04AA6D;
  color: white;
  border-radius: 25px;
  font-size: 18px;
  width:200px;
}

.tut-button {
  background-color: #04AA6D;
  color: white;
  font-size: 18px;
  margin: auto;
  display: block;
  width: 200px;
  border-radius: 25px;
}

.w3csstut {
  height: 390px;
}

.tut-button:hover,.tryit-button:hover,.exercise-button:hover,#getdiploma a:hover {
  background-color: #059862 !important;
  color:white!important;
}

.bar-item-hover:hover {
  background-color: #04AA6D!important;
  color:white!important;
}

.bar-icon-hover:hover {
  background-color: black!important;
  color:white!important;
}

.w3-bar .fa-logo:hover {
  color:#059862!important;
}

.mystyle,.mystyle:hover {
  background-color: #282A35!important;
  color:white!important;
}

.ref-button {
  background-color: white;
  font-size: 18px;
  margin: auto;
  display: block;
  width: 200px;
  border-radius: 25px;
  color: #000;
}

.ref-button:hover {
  background-color: #E7E9EB!important;
  color: black;
}

.black-color {
  background-color: #282A35;
  color: white;
}

.black-color:hover {
  background-color: #000!important;
  color: white!important;
}

.grey-color {
  background-color: #E7E9EB;
  color: black
}

.exercise-button {
  padding: 70px 50px;
  font-size: 35px;
  width:87%;
  opacity:0.97;
}



@media screen and (max-width:768px) {
  h1,
  .w3-jumbo {
    font-size: 60px !important;
  }
}

#w3_cert_badge_default {
  position: absolute;
  right: 25px;
  width: 220px;
  transform: rotate(10deg);
  bottom: -130px;
}

#w3_cert_arrow_default {
  position: absolute;
  right: 200px;
  width: 220px;
  transform: rotate(10deg);
  bottom: -50px;
  z-index: 1;
}

#howto_padding {
  padding: 0px 24px 100px 24px
}

#getdiploma {
  position: relative;
  padding: 0 60px 50px 60px;
  margin-bottom: 85px;
  background-color: #282A35;
  color: #FFC0C7;
  font-family: 'Source Sans Pro', sans-serif;
}

#getdiploma p {
  font-size: 52px;
  margin-top: 1em;
  margin-bottom: 1em;
  font-family: 'Source Sans Pro', sans-serif;
}

#getdiploma h2 {
  font-size: 62px;
  margin-top: 1em;
  margin-bottom: 1em;
  font-family: 'Source Sans Pro', sans-serif;
}

#getdiploma a {
  border-radius: 50px;
  font-size: 18px;
  background-color: #04AA6D;
  padding: 17px 55px
}


@media screen and (max-width: 992px) {
  #w3_cert_arrow_default {
    right:128px;
    bottom:-80px
  }
  .w3csstut {
  height: auto;
}
  #w3_cert_badge_default {
    width: 150px;
    right: 2%;
    bottom:-110px
  }

}


@media screen and (max-width: 800px) {
  #w3_cert_arrow_default {
    display: none;
  }
  #getdiploma h2 {
    font-size: 55px;
  }
}


@media screen and (max-width: 600px) {
  #w3_cert_badge_default {
    top: -95px;
    right: 10px;
    width: 100px;
  }
  
  #howto_padding {
    padding: 0px 24px 90px 24px
  }

  #getdiploma p {
    font-size: 40px;
  }
  #getdiploma a {
    width: 100%;
     margin-bottom:45px;
  }
  div.ext_icon_container {
    background-color:transparent!important;
  }
}
.tutbuttons a{
  text-decoration:none;
}

.tutbuttons a div {
  opacity:0.9;
}

.tutbuttons a:hover div {
  opacity:1;
}

.ws-yellow-hover:hover {
  background-color:#fff080!important;
  color:black!important;
}

.ws-pink-hover:hover {
  background-color:#ffb3bb!important;
  color:black!important;
}

#google_translate_element {
  z-index:7!important;
}

@media screen and (max-width: 860px) {
  .ws-hide-860 {
    display: none !important;
  }
 
}
@media screen and (max-width: 1080px) {
  .ws-hide-1080 {
    display: none !important;
  }
}
@media screen and (max-width: 1160px) {
  .ws-hide-1160 {
    display: none !important;
  }
}
@media screen and (max-width: 1200px) {
  .ws-hide-1200 {
    display: none !important;
  }
}
@media screen and (max-width: 1300px) {
  .ws-hide-1300 {
    display: none !important;
  }
}
@media screen and (max-width: 1350px) {
  .ws-hide-1350 {
    display: none !important;
  }
}

@media screen and (max-width: 950px) {
  .ws-hide-950 {
    display: none !important;
  }
}
#howto_iframe {
   width: 100%;
   border: 6px solid #e3e6e8;
   height: 400px;
   border-bottom-left-radius:4px;
   border-bottom-right-radius:4px;
}

.vl-howto {
  border-left: 50px solid #282A35;
  height: 80px;
  position: absolute;
  top:-6px;
  left:50%;
  margin-left:-25px;
}
.vl-howtobtn {
  width:50%;
  margin-top:73px;
}

@media screen and (max-width: 1400px) {
  .ws-hide-1400 {
    display: none !important;
  }
}

@media screen and (max-width: 1250px) {
  .ws-hide-1250 {
    display: none !important;
  }
}
@media screen and (max-width: 900px) {
  #howto_iframe {
    height: 360px;
  }
}
@media screen and (max-width: 800px) {
  #howto_iframe {
    height: 320px;
  }
}
@media screen and (max-width: 700px) {
  #howto_iframe {
    height: 280px;
  }
  .codeeditorbr-input {
    margin-left: 15px;
  }
  .vl-howto {
    height:45px;
  }
.vl-howtobtn {
  margin-top:37px;
}
}
@media screen and (max-width:584px) {
  #howto_iframe {
    height: 245px;
  }
}
@media screen and (max-width:500px) {
  #howto_iframe {
    height: 215px;
  }
}
@media screen and (max-width:450px) {
  #howto_iframe {
    height: 203px;
  }
}
.codeeditorbr-container {
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}

.codeeditorbr-row {
  padding: 10px;
  background: #f1f1f1;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}

.codeeditorbr-column {
  float: left;
}

.codeeditorbr-left {
  width: 20%;
}

.codeeditorbr-middle {
  width: 80%;
}

@media screen and (max-width: 800px) {
  .codeeditorbr-left {
    width: 24%;
  }

  .codeeditorbr-middle {
    width: 76%;
  }
}

.codeeditorbr-row:after {
  content: "";
  display: table;
  clear: both;
}

.codeeditorbr-dot {
  margin-top: 5px;
  height: 15px;
  width: 15px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  margin-left: 3px;
}

.codeeditorbr-input {
  width: 80%;
  border-radius: 3px;
  border: none;
  background-color: white;
  margin-top: -8px;
  height: 22px;
  color: #666;
  font-size: 14px;
  padding: 5px;
}

.hover-yellow:hover {
  background-color: #fff080 !important;
  color: black !important;
}

.codeeditorbr-tablink {
  font-size: 17px;
  font-family: 'Source Sans Pro', sans-serif;
  border: none;
  display: inline-block;
  padding: 6px 18px;
  vertical-align: middle;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  text-align: center;
  cursor: pointer;
  white-space: nowrap;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  color: #ffffff;
}

.codeeditorbr-tablink:hover {
  background-color: #E7E9EB !important
}

.hover-yellow:hover {
  background-color:#fff080!important;
  color:black!important;
}
#bgcodeimg {
  background: #282A35 url("/about/w3codes.webp") no-repeat fixed center;
}
#bgcodeimg2 {
  background: #282A35 url("https://www.w3schools.com/spaces/files/priscilla-du-preez-XkKCui44iM0-unsplash.921aa0c0.webp") no-repeat fixed center;
}

form.example {
  position:relative;
}
form.example input[type=text] {
  padding: 10px;
  font-size: 17px;
  border: 1px solid #282A35;
  border-radius:25px;
  float: left;
  width: 80%;
  padding-left:25px;
  background: white;
  border-top-right-radius:0;
  border-bottom-right-radius:0;
  border-right:0;
  border-right: 1px solid #04AA6D;
  outline:0;
}

form.example button {
  border-radius:25px;
  float: left;
  width: 20%;
  padding: 10px;
  background:#04AA6D;
  color: white;
  font-size: 17px;
  border: 1px solid #282A35;
  border-left: none;
  cursor: pointer;
  border-top-left-radius:0;
  border-bottom-left-radius:0;
}

form.example button:hover {
  background: #059862;
  color: white;
}

form.example::after {
  content: "";
  clear: both;
  display: table;
}

#listofsearchresults {
  display:none;
  position:absolute;
  background-color:#282A35;
  background-color:#fff;
  color:#000;
  width:80%;
  top:47px;
  border-left: 1px solid #282A35;
  border-right: 1px solid #282A35;
  border-bottom: 1px solid #282A35;
  text-align:left;
}
#listofsearchresults a {
  background-color:#e2e3e9;
  background-color:#fff;
  color:#777;
  text-decoration:none;
  display:block;
  padding:10px 30px;
  width:100%;
  opacity:0.95;
}
#listofsearchresults a:hover {
  color:#000;
  opacity:1;
}
.span_search {
  background-color:#ffecee;
}
.search_active {
  background-color:#ffecee!important;
  color:#000!important;
}
.search_active .span_search {
  background-color:#ffccd1;
}

.learntocodeh1 {
  font-size:70px;
  font-weight:700;
}

.learntocodeh3 {
  color:#FFF4A3;
  font-weight:700;
  margin-top:30px!important;
  font-size:23px;
}
.learntocodeh4 {
  color:white;
  font-size:23px;
  font-weight:700;
  margin-top:30px!important;
}
.learntocodeh4 a:hover,.learntocodeh4 a:active {
  color:#FFF4A3;
}
.learntocodecontent {
  padding-left:90px;
  padding-right:90px;
}

@media screen and (max-width: 600px) {
  .learntocodeh1 {
    font-size:50px!important;
  }
  .learntocodeh3 {
    font-size:21px!important;
  }
  .learntocodecontent {
    padding-left:35px;
    padding-right:35px;
  }
  form.example input[type=text],form.example button {
  font-size: 16px;
 }
   form.example input[type=text] {
   padding-left:16px;
 }
}

@media screen and (max-width: 1006px) and (min-width: 992px) {
  .ws-hide-special  {
    display:none;
  }
}

.grey-color {
  background-color: #E7E9EB;
  color: #000;
}
.icons-right {
  color:#f1f1f1;
}
body.darkpagetheme .grey-color {
  background-color: #38444d;
  color: #ddd;
}

body.darkpagetheme .bar-icon-hover:hover,body.darkpagetheme .fa-logo:hover {
  background-color: #1d2a35!important;
  color:white!important;
}

body.darkpagetheme #main {
  border-right:0;
}
body.darkpagetheme #wavepath {
  fill: rgb(40,42,53);
}

table.gstl_50 {/*google search suggestions*/
  color:#000;
}
.topnavmain_pro {
  background-color:#9763f6;
  color:#fff;
}
.topnavmain_pro:hover {
  background-color:#7d53cc!important;
  color:#fff!important;
}

body.darkpagetheme .icons-right  {
    color: #eee;
}

.pro-caption {
  padding: 78px 35px 96px 35px;
  text-align: center
}

.pro-caption h1 {
  font-weight: 700;
  font-size: 52px;
  line-height: 55px;
  padding-top: 11px;
  padding-bottom: 20px;
  font-family: Source Sans Pro;
  color: #fff;
  margin: 0
}

.pro-caption h3 {
  font-size: 25px;
  color: #FFC0C7;
  margin:19px 0;
}

.pro-caption li {
  font-size:20px;
  line-height:36px;
  text-align:left;
  list-style-type:none;
}

@media screen and (max-width:620px) {
  .pro-caption {padding: 70px 15px 70px 15px;}
  .pro-caption h1 {font-size:50px;}
  .pro-caption h3 {font-size:24px;}
  .pro-caption li {font-size:18px;}
}

@media screen and (max-width:550px) {
  .pro-caption h1 {font-size:40px;}
  .pro-caption h3 {font-size:24px;}
  .pro-caption li {font-size:18px;}
}
#footer .w3-small,#footer a {
  font-family: Verdana,sans-serif;
}
</style>
<script type="text/javascript" async="" charset="utf-8" src="https://cdn.snigelweb.com/adconsent/86/adconsent__tcfapi.js"></script><script type="text/javascript" async="" charset="utf-8" src="https://cdn.snigelweb.com/adconsent/86/views/gdpr/adconsent__tcfapi_en.js"></script></head>
<body style="font-family: 'Source Sans Pro', sans-serif;" class="">
<div id="tnb-search-suggestions"></div>

<div id="top-nav-bar" class="classic">
  <div id="pagetop" class="w3-bar notranslate w3-white">
    <a id="w3-logo" href="https://www.w3schools.com" class="w3-bar-item w3-button w3-hover-none w3-left ga-top ga-top-w3home" title="Home" style="width: 75px" aria-label="Home link">
      <i class="fa fa-logo ws-hover-text-green" style="position: relative; z-index: 1; color: #04aa6d; font-size: 36px !important" aria-hidden="true"></i>
    </a>

    <nav class="tnb-desktop-nav w3-bar-item">
      <a onclick="TopNavBar.openNavItem('tutorials')" class="tnb-nav-btn w3-bar-item w3-button barex bar-item-hover w3-padding-16 ga-top ga-top-tut-and-ref" href="javascript:void(0)" id="navbtn_tutorials" title="Tutorials and References" role="button">
        Tutorials
        <i class="fa fa-caret-down" style="font-size: 15px" aria-hidden="true"></i>
        <i class="fa fa-caret-up" style="display: none; font-size: 15px" aria-hidden="true"></i>
      </a>

      <a onclick="TopNavBar.openNavItem('exercises')" class="tnb-nav-btn w3-bar-item w3-button barex bar-item-hover w3-padding-16 ga-top ga-top-exc-and-quz" href="javascript:void(0)" id="navbtn_exercises" title="Exercises and Quizzes" role="button">
        Exercises
        <i class="fa fa-caret-down" style="font-size: 15px" aria-hidden="true"></i>
        <i class="fa fa-caret-up" style="display: none; font-size: 15px" aria-hidden="true"></i>
      </a>

      <a onclick="TopNavBar.openNavItem('certified')" class="tnb-nav-btn w3-bar-item w3-button barex bar-item-hover w3-padding-16 tnb-paid-service ga-top ga-top-cert-and-course" href="javascript:void(0)" id="navbtn_certified" title="Certificates" role="button">
        Certificates
        <i class="fa fa-caret-down" style="font-size: 15px" aria-hidden="true"></i>
        <i class="fa fa-caret-up" style="display: none; font-size: 15px" aria-hidden="true"></i>
      </a>

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                    HTML
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/html-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-html" title="HTML Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/html-course" class="ws-btn acclink-text ga-top-dropga-top-drop-course-html" title="Paid HTML Course">
                    Course
                  </a>
                </div>
                <div data-name="css" data-category="html_and_css" data-original-index="1">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/css-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-css" title="CSS Certification Exam">
                    CSS
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/css-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-css" title="CSS Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/css-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-css" title="Paid CSS Course">
                    Course
                  </a>
                </div>
                <div data-name="bootstrap" data-category="html_and_css" data-original-index="2">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/bootstrap-3-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-bs3" title="Bootstrap 3 Certification Exam">
                    Bootstrap 3
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/bootstrap-3-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-bs3" title="Bootstrap 3 Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/single-courses/products/bootstrap-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-bs3" title="Paid Bootstrap 3 Course">
                    Course
                  </a>
                </div>
                <div data-name="bootstrap4" data-category="html_and_css" data-original-index="3">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/bootstrap-4-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-bs4" title="Bootstrap 4 Certification Exam">
                    Bootstrap 4
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/bootstrap-4-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-bs4" title="Bootstrap 4 Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/single-courses/products/bootstrap-4-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-bs4" title="Paid Bootstrap 4 Course">
                    Course
                  </a>
                </div>
                <div data-name="bootstrap5" data-category="html_and_css" data-original-index="4">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/bootstrap-5-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-bs5" title="Bootstrap 5 Certification Exam">
                    Bootstrap 5
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/bootstrap-5-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-bs5" title="Bootstrap 5 Certification Exam">
                    Certificate
                  </a>
                </div>
              </div>

              <div id="certified_data_analytics_links_list_desktop" class="w3-hide-small">
                <h3 class="tnb-nav-section-title" data-heading="data_analytics_title">
                  Data Analytics
                </h3>
                <div data-name="dsa" data-category="data_analytics" data-original-index="0">
                  <a target="_blank" href="https://campus.w3schools.com/products/dsa-certification-exam" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-dsa" title="DSA Certificate Exam">
                    DSA
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/dsa-certification-exam" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-dsa" title="DSA Certificate Exam">
                    Certificate
                  </a>
                </div>
                <div data-name="data analytics" data-category="data_analytics" data-original-index="1">
                  <a target="_blank" href="https://campus.w3schools.com/products/data-analytics-program" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-course-data-analytic" title="Paid Data Analytics Course">
                    Data Analytics
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/data-analytics-program" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-data-analytic" title="Paid Data Analytics Course">
                    Course
                  </a>
                </div>
                <div data-name="numpy" data-category="data_analytics" data-original-index="2">
                  <a target="_blank" href="https://campus.w3schools.com/products/numpy-certification-exam" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-numpy" title="NumPy Certification Exam">
                    NumPy
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/numpy-certification-exam" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-numpy" title="NumPy Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/numpy-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-numpy" title="Paid NumPy Course">
                    Course
                  </a>
                </div>
                <div data-name="pandas" data-category="data_analytics" data-original-index="3">
                  <a target="_blank" href="https://campus.w3schools.com/products/pandas-certification-exam" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-pandas" title="Pandas Certification Exam">
                    Pandas
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/pandas-certification-exam" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-pandas" title="Pandas Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/pandas-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-pandas" title="Paid Pandas Course">
                    Course
                  </a>
                </div>
                <div data-name="excel" data-category="data_analytics" data-original-index="4">
                  <a target="_blank" href="https://campus.w3schools.com/products/excel-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-excel" title="Excel Certification Exam">
                    Excel
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/excel-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-excel" title="Excel Certification Exam">
                    Certificate
                  </a>
                </div>
                <div data-name="social media" data-category="data_analytics" data-original-index="5">
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/social-media-marketing-course" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-course-some" title="Paid Social Media Course">
                    Social Media
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/social-media-marketing-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-some" title="Paid Social Media Course">
                    Course
                  </a>
                </div>
                <div class="black-box-container" data-original-index="6">
                  <a target="_blank" href="https://campus.w3schools.com" class="w3-bar-item w3-button ga-top-drop w3-center w3-round ga-top-drop-campus" title="W3Schools Campus" style="display: block; background-color: #21232c; border: 1px solid grey; width: 195px; margin-bottom: 16px">
                    What is a Certificate?
                  </a>
                </div>
              </div>

              <div class="certified_programs_links_list w3-hide-large w3-hide-small">
                <h3 class="tnb-nav-section-title" data-heading="programs_title">
                  Programs
                </h3>
                <div data-name="full access" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/w3schools-full-access-course" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-course-fullaccess" title="Paid Full Access Course">
                    Full Access
                    <span class="ribbon-topnav ws-green" style="font-size: 13px; font-weight: normal">
                      Best Value!
                    </span>
                  </a>
                </div>
                <div data-name="front end" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/front-end-course" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-front-end" title="Paid Front End Course">
                    Front End
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/front-end-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-front-end" title="Front End Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/front-end-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-front-end" title="Paid Front End Development Course">
                    Course
                  </a>
                </div>
                <div data-name="web design" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/modern-web-development-certification" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-dev" title="Web Development Certification">
                    Web Dev.
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/modern-web-development-certification" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-dev" title="Web Development Certification">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/learn-modern-web-development" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-dev" title="Paid Web Development Course">
                    Course
                  </a>
                </div>
                <div data-name="web development" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-application-development-certificates" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-app" title="Web Application Development Certification">
                    Web App
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-application-development-certificates" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-app" title="Web Application Development Certification">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/web-application-development-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-app" title="Paid Web Application Course">
                    Course
                  </a>
                </div>
                <div data-name="web app" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-design-certification" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-design" title="Web Design Certification Exam">
                    Web Design
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-design-certification" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-design" title="Web Design Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/learn-web-design" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-design" title="Paid Web Design Course">
                    Course
                  </a>
                </div>
              </div>
            </div>

            <div class="w3-col l4 m6">
              <div id="certified_javascript_links_list">
                <h3 class="tnb-nav-section-title" data-heading="javascript_title">
                  JavaScript
                </h3>
                <div data-name="javascript" data-category="javascript" data-original-index="0">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/javascript-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-js" title="JavaScript Certification Exam">
                    JavaScript
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/javascript-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-js" title="JavaScript Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/javascript-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-js" title="Paid JavaScript Course">
                    Course
                  </a>
                </div>
                <div data-name="react" data-category="javascript" data-original-index="1">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/react-js-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-react" title="React.js Certification Exam">
                    React
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/react-js-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-react" title="React.js Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/react-js-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-react" title="Paid React.js Course">
                    Course
                  </a>
                </div>
                <div data-name="jquery" data-category="javascript" data-original-index="2">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/jquery-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-jquery" title="jQuery Certification Exam">
                    jQuery
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/jquery-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-jquery" title="jQuery Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/jquery-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-jquery" title="Paid jQuery Course">
                    Course
                  </a>
                </div>
                <div data-name="vue" data-category="javascript" data-original-index="3">
                  <a target="_blank" href="https://campus.w3schools.com/products/vue-js-certification-exam" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-vue" title="Vue Certification Exam">
                    Vue
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/products/vue-js-certification-exam" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-vue" title="Vue Certification Exam">
                    Certificate
                  </a>
                </div>
              </div>

              <div class="certified_programs_links_list w3-hide-medium w3-hide-large">
                <h3 class="tnb-nav-section-title" data-heading="programs_title">
                  Programs
                </h3>
                <div data-name="full access" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/w3schools-full-access-course" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-course-fullaccess" title="Paid Full Access Course">
                    Full Access
                    <span class="ribbon-topnav ws-green" style="font-size: 13px; font-weight: normal">
                      Best Value!
                    </span>
                  </a>
                </div>
                <div data-name="front end" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/front-end-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-front-end" title="Front End Certification Exam">
                    Front End
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/front-end-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-front-end" title="Front End Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/front-end-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-front-end" title="Paid Front End Development Course">
                    Course
                  </a>
                </div>
                <div data-name="web dev." data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/modern-web-development-certification" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-dev" title="Web Development Certification">
                    Web Dev.
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/modern-web-development-certification" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-dev" title="Web Development Certification">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/learn-modern-web-development" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-dev" title="Paid Web Development Course">
                    Course
                  </a>
                </div>
                <div data-name="web app" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-application-development-certificates" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-app" title="Web Application Development Certification">
                    Web App
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-application-development-certificates" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-app" title="Web Application Development Certification">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/web-application-development-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-app" title="Paid Web Application Course">
                    Course
                  </a>
                </div>
                <div data-name="web design" data-category="programs">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-design-certification" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-design" title="Web Design Certification Exam">
                    Web Design
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-design-certification" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-design" title="Web Design Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/learn-web-design" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-design" title="Paid Web Design Course">
                    Course
                  </a>
                </div>
              </div>
              <div class="certified_programs_links_list w3-hide-medium w3-hide-small" id="certified_programs_links_list_desktop">
                <h3 class="tnb-nav-section-title" data-heading="programs_title">
                  Programs
                </h3>
                <div data-name="full access" data-category="programs" data-original-index="0">
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/w3schools-full-access-course" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-course-fullaccess" title="Paid Full Access Course">
                    Full Access
                    <span class="ribbon-topnav ws-green" style="font-size: 13px; font-weight: normal">
                      Best Value!
                    </span>
                  </a>
                </div>
                <div data-name="front end" data-category="programs" data-original-index="1">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/front-end-certificate" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-front-end" title="Front End Certification Exam">
                    Front End
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/front-end-certificate" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-front-end" title="Front End Certification Exam">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-catalog/products/front-end-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-front-end" title="Paid Front End Development Course">
                    Course
                  </a>
                </div>
                <div data-name="web dev." data-category="programs" data-original-index="2">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/modern-web-development-certification" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-dev" title="Web Development Certification">
                    Web Dev.
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/modern-web-development-certification" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-dev" title="Web Development Certification">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/learn-modern-web-development" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-dev" title="Paid Web Development Course">
                    Course
                  </a>
                </div>
                <div data-name="web app" data-category="programs" data-original-index="3">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-application-development-certificates" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-app" title="Web Application Development Certification">
                    Web App
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-application-development-certificates" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-app" title="Web Application Development Certification">
                    Certificate
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/course-best-sellers/products/web-application-development-course" class="ws-btn acclink-text ga-top-drop ga-top-drop-course-web-app" title="Paid Web Application Course">
                    Course
                  </a>
                </div>
                <div data-name="web design" data-category="programs" data-original-index="4">
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-design-certification" class="w3-bar-item w3-button acctop-link ga-top-drop ga-top-drop-cert-web-design" title="Web Design Certification Exam">
                    Web Design
                  </a>
                  <a target="_blank" href="https://campus.w3schools.com/collections/certifications/products/web-design-certification" class="ws-btn acclink-text ga-top-drop ga-top-drop-cert-web-design" title="Web Design Certification Exam">
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<span class="tagnamecolor" style="color:brown"><span class="tagcolor" style="color:mediumblue">&lt;</span>button<span class="attributecolor" style="color:red"> onclick<span class="attributevaluecolor" style="color:mediumblue">="myFunction()"</span></span><span class="tagcolor" style="color:mediumblue">&gt;</span></span>Click Me!<span class="tagnamecolor" style="color:brown"><span class="tagcolor" style="color:mediumblue">&lt;</span>/button<span class="tagcolor" style="color:mediumblue">&gt;</span></span><br><br>
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  ["", "/tryit/tryit.asp?filename=tryhtml_hello", "HTML Compiler"],
  ["", "/python/trypython.asp?filename=demo_default", "Python Compiler"],  
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  ["", "/cpp/trycpp.asp?filename=demo_helloworld", "C++ Compiler"],    
  ["", "/c/tryc.php?filename=demo_helloworld", "C Compiler"],            
  ["", "/cs/trycs.php?filename=demo_helloworld", "C# Compiler"],            
  ["", "/r/tryr.asp?filename=demo_default", "R Compiler"],            
  ["", "/kotlin/trykotlin.php?filename=demo_helloworld", "Kotlin Compiler"],            
  ["", "/go/trygo.php?filename=demo_helloworld", "GO Compiler"],            
  ["", "/typescript/trytypescript.php?filename=demo_helloworld", "TypeScript Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_bash", "Bash Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_clojure", "Clojure Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_fortran", "Fortran Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_nodejs", "Node.js Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_perl", "Perl Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_ruby", "Ruby Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_scala", "Scala Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_swift", "Swift Compiler"],            
  ["", "/tryit/trycompiler.asp?filename=demo_vbnet", "VB.NET Compiler"],                
  
      
];
*/
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