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index.html
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<!DOCTYPE html>
<html lang="en-US">
<!-- Mirrored from www.w3schools.com/ by HTTrack Website Copier/3.x [XR&CO'2014], Thu, 14 Oct 2021 04:13:53 GMT -->
<head>
<title>W3Schools Online Web Tutorials</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="Keywords" content="HTML, Python, CSS, SQL, JavaScript, How to, PHP, Java, C++, jQuery, Bootstrap, C#, Colors, W3.CSS, XML, MySQL, Icons, NodeJS, React, Graphics, Angular, R, AI, Git, Data Science, Code Game, Tutorials, Programming, Web Development, Training, Learning, Quiz, Courses, Lessons, References, Examples, Source code, Demos, Tips">
<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.">
<link rel="icon" href="favicon.ico" type="image/x-icon">
<link rel="preload" href="lib/fonts/fontawesome8deb.woff2?14663396" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="lib/fonts/source-code-pro-v14-latin-regular.woff2" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="lib/fonts/roboto-mono-v13-latin-500.woff2" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="lib/fonts/source-sans-pro-v14-latin-700.woff2" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="lib/fonts/source-sans-pro-v14-latin-600.woff2" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="lib/fonts/freckle-face-v9-latin-regular.woff2" as="font" type="font/woff2" crossorigin>
<link rel="stylesheet" href="lib/w3schools28.css">
<script>
function gSearch(el) {
var cx = '012971019331610648934:m2tou3_miwy';
var gcse = document.createElement('script'); gcse.id = 'gSearch'; gcse.type = 'text/javascript'; gcse.async = true;
gcse.src = '../cse.google.com/cse/cse07b6.html?cx=' + cx;
var el = document.getElementById('gSearch');
if (el == null) {
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(gcse, s);
}
open_search(el);
};
function gTra(el) {
var gtra = document.createElement('script'); gtra.id = 'gTra'; gtra.type = 'text/javascript'; gtra.async = true;
gtra.src = '../translate.google.com/translate_a/elementa0d8.html?cb=googleTranslateElementInit';
var el = document.getElementById('gTra');
if (el == null) {
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(gtra, s);
}
open_translate(el);
};
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','../www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-3855518-1', 'auto');
ga('require', 'displayfeatures');
ga('require', 'GTM-WJ88MZ5');
ga('send', 'pageview');
</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;
}
}
.fa {
font-size: 20px;
}
#main {
padding: 0;
border-right: none;
}
.fa-thumbs-o-up:hover {
color: #fff;
}
@media (min-width:1675px) {
#main {
width: auto;
}
}
#nav_tutorials,
#nav_references,
#nav_exercises {
display: none;
padding-bottom: 40px;
position: absolute;
width: 100%;
z-index: 5 !important;
}
#nav_tutorials h3,
#nav_references h3,
#nav_exercises h3,
#sectionxs_tutorials h3,
#sectionxs_references h3,
#sectionxs_exercises h3 {
padding-left: 6px;
color: #FFF4A3;
}
div.cse .gsc-control-cse,
div.gsc-control-cse {
padding: 0;
margin-top: 0;
}
/* Customize W3.CSS */
.w3-col.l4 .w3-card-2 {
padding: 15px 10px;
height: 260px;
}
.w3-bar {
position: relative;
z-index: 4;
font-size: 18px;
background-color: white;
color:#282A35;
}
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,.fa-logo:hover {
background-color: white !important;
color:#059862!important;
}
.mystyle,.mystyle:hover {
background-color: #282A35!important;
color:white!important;
}
.closenav_span:hover {
background-color: #282A35!important;
color: #059862!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;
}
#w3loginbtn {
width:70px;
background-color:#04AA6D;
color:white;
border-radius:25px;
font-size:12px;
line-height:2;
display:none;
}
#loginactioncontainer {
margin-left:0;
}
@media screen and (min-width:601px) {
#navbtn_menu {
display: block;
}
}
@media screen and (min-width:600px) {
#w3loginbtn {
width:130px;
line-height:1.5;
font-size:18px;
}
#loginactioncontainer {
margin-left:50px;
}
}
@media screen and (min-width:861px) {
#myAccordion,#navbtn_menu,
.hidesm {
display: none !important;
}
}
@media screen and (max-width:400px) {
#nav_translate_btn,#nav_search_btn,#navbtn_menu {
padding:8px 8px;
}
#loginactioncontainer {
width:70px;
}
}
@media screen and (max-width:860px) {
.barex, .navex {
display: none !important;
}
#googleSearch, #google_translate_element {
top:75px;
width:100%!important;
right:0!important;
padding-top:19px!important;
}
}
@media screen and (max-width:768px) {
h1,
.w3-jumbo {
font-size: 60px !important;
}
}
@media screen and (max-width:380px) {
div.cse .gsc-control-cse,
div.gsc-control-cse {
padding: 0;
margin-top: -4px;
}
}
#w3_cert_badge {
position: absolute;
right: 5%;
width: 220px;
transform: rotate(10deg);
bottom: -15%;
}
#w3_cert_arrow {
position: absolute;
right: 240px;
width: 220px;
transform: rotate(10deg);
bottom: 0;
z-index: 1;
}
#howto_padding {
padding: 48px 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: 680px) {
#w3_cert_badge {
width: 150px;
right: 2%;
}
}
@media screen and (max-width: 1155px) {
#w3_cert_arrow {
display: none;
}
}
@media screen and (max-width: 992px) {
#w3_cert_arrow {
display: block;
}
.w3csstut {
height: auto;
}
}
@media screen and (min-width: 1844px) {
#w3_cert_badge {
width: 190px;
right: 2%;
}
#w3_cert_arrow {
right: 169px;
}
}
@media screen and (max-width: 800px) {
#w3_cert_arrow {
display: none;
}
#getdiploma h2 {
font-size: 55px;
}
}
@media screen and (max-width: 600px) {
#w3_cert_badge {
top: -35px;
right: 10px;
width: 100px;
}
#howto_padding {
padding: 2px 24px 90px 24px
}
}
@media screen and (max-width: 500px) {
#getdiploma p {
font-size: 40px;
}
#getdiploma a {
width: 100%;
}
}
.tutbuttons a{
text-decoration:none;
}
.tutbuttons a div {
opacity:0.9;
}
.tutbuttons a:hover div {
opacity:1;
}
.ribbon-vid {
width: 60px;
font-size:14px;
padding: 5px;
position: absolute;
left:-20px;
top:-10px;
text-align: center;
color:black;
border-radius:25px;
-ms-transform: rotate(-20deg); /* IE 9 */
transform: rotate(-20deg);
}
.ws-yellow-hover:hover {
background-color:#fff080!important;
color:black!important;
}
.ribbon-topnav {
font-size:11px;
font-weight:bold;
padding:3px 10px;
margin-left:3px;
text-align: center;
color:black;
border-radius:25px;
border:1px solid black;
position:relative;
top:-2px;
background-color:white;
}
@media screen and (max-width: 1152px) {
.ribbon-topnav {
display: none !important;
}
}
@media screen and (max-width: 1080px) {
.ws-hide-1080 {
display: none !important;
}
}
@media screen and (max-width: 1200px) {
.ws-hide-1200 {
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: 1200px) {
.ws-hide-1200 {
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;
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