Xiaoqiang's road to HTML5 mobile development (5) – making a beautiful video player-H5 Tutorial-php.cn

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Xiaoqiang's road to HTML5 mobile development (5) – making a beautiful video player

黄舟

May 24, 2018 pm 02:40 PM

In the previous articles, we introduced the characteristics of HTML5 and the basic knowledge that needs to be mastered. Now let’s start to truly experience the advantages of Html5. Let’s start making a beautiful video player. Don’t worry, before we start making it. Let’s first understand the basic knowledge of video files.

1. Video format

The currently more mainstream and commonly used video formats are: avi, rmvb, wmv, mpeg4, ogg, and webm. These videos are composed of three parts: video, audio, and encoding format. In HTML5, there are currently many different sets of encoders depending on the browser:

H.264 (personally not optimistic): This encoder is the encoder in Apple systems including Apple mobile phones, and has a patent video encoder. Royalties may be charged for any part of the encoding and transmission process. Therefore, Safari (Apple's browser) and Internet Explorer support this encoder. However, at a time when open source has become a general trend, it is still charging patent fees in browsers. I am really not optimistic about it.

Theora: This is a patent-free encoding format and a free video encoder for all levels of encoding, transmission and playback. Chrome, Firefox and Opera support this encoder.

VP8: This video encoder is similar to Theora, but its owner is Google, which has been open source, so no patent fees are required. Chrome, Firefox and Opera support this encoder.

AAC: audio codec, the same as H.264, this audio codec has patent restrictions, Safari, Chrome and Internet Explorer support this audio codec.

MP3: Also a patented technology, this audio encoder is supported by Safari, Chrome and Internet Explorer.

PCM: A format for storing data on audio CDs that stores complete data encoded by an analog-to-digital converter. Therefore, the file size of the Chinese lossless encoder is generally several times that of AAC and MP3 files. Safari, Firefox and Internet Explorer support this audio encoder.

Vorbis: The file extension is .ogg, sometimes also called Ogg Vorbis. This audio encoder is not protected by patents and is therefore copyright free. Supported browsers include Chrome, Firefox and Opera.

Video and audio supported by major browsers and devices

Xiaoqiangs road to HTML5 mobile development (5) – making a beautiful video player

In html5, you can use the

<video src="move.mp4"></video>

There are many attributes in the video tag. For example, the controls attribute can control whether There is a console.

<video src="move.mp4" controls="controls">  
    浏览器不支持HTML5的视频播放功能  
</video>

From the above video formats, we can see that different browsers support different video formats, so we can use the tag to specify videos in multiple formats. By default, the browser will automatically Start downloading the file to determine its type.

<video width="400" controls="controls">  
    <source src="move.mp4"  type="video/mp4" />  
    <source src="move.ogg"  type="video/ogg" />  
</video>

3. Making a video player

index.html

<!DOCTYPE html>  
<html>  
<head>  
<title>Demo 1 | Custom HTML5 Video Controls with jQuery</title>  
<link rel="stylesheet" href="../vendorstyle.css" />  
<link rel="stylesheet" href="style.css" />  
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>  
<!--[if lt IE 9]>  
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>  
<![endif]-->  
<script src="../vendorscript.js"></script>  
<script src="video.js"></script>  
<!--[if lt IE 9]>  
<script>  
$(document).ready(function() {  
    $(&#39;.control&#39;).hide();  
    $(&#39;.loading&#39;).fadeOut(500);  
    $(&#39;.caption&#39;).fadeOut(500);  
});  
</script>  
<![endif]-->  
<link rel="shortcut icon" href="http://www.inwebson.com/wp-content/themes/inwebson/favicon.ico" />  
</head>  
  
<body>  
<!-- Header -->  
<header>  
    <h1 id="Custom-nbsp-HTML-nbsp-Video-nbsp-Controls-nbsp-with-nbsp-jQuery">Custom HTML5 Video Controls with jQuery</h1>  
    <p id="backlinks">  
 <a href="http://www.inwebson.com/custom-html5-video-controls-with-jquery-and-css/">BACK TO ARTICLE »</a>  
        <a href="http://www.inwebson.com">Visit inWebson.com »</a>  
    </p>  
    <p class="clearfix"></p>  
</header>  
  
<!-- Content -->  
<section id="wrapper">  
  
    <!-- Title -->  
    <h2 id="Demo-nbsp">Demo 1</h2>  
    <h3 id="Custom-nbsp-HTML-nbsp-Video-nbsp-Controls">Custom HTML5 Video Controls</h3>  
  
<p class="videoContainer">  
      
    <video id="myVideo" controls preload="auto" poster="poster.jpg" width="600" height="350" >  
      <source src="http://demo.inwebson.com/html5-video/iceage4.mp4" type="video/mp4" />  
      <source src="http://demo.inwebson.com/html5-video/iceage4.webm" type="video/webM" />  
      <source src="http://demo.inwebson.com/html5-video/iceage4.ogv" type="video/ogg" />  
      <p>Your browser does not support the video tag.</p>  
    </video>  
    <p class="caption">This is HTML5 video with custom controls</p>  
    <p class="control">  
  
        <p class="topControl">  
            <p class="progress">  
                <span class="bufferBar"></span>  
                <span class="timeBar"></span>  
            </p>  
            <p class="time">  
                <span class="current"></span> /   
                <span class="duration"></span>   
            </p>  
        </p>  
          
        <p class="btmControl">  
            <p class="btnPlay btn" title="Play/Pause video"></p>  
            <p class="btnStop btn" title="Stop video"></p>  
            <p class="spdText btn">Speed: </p>  
            <p class="btnx1 btn text selected" title="Normal speed">x1</p>  
            <p class="btnx3 btn text" title="Fast forward x3">x3</p>  
            <p class="btnFS btn" title="Switch to full screen"></p>  
            <p class="btnLight lighton btn" title="Turn on/off light"></p>  
            <p class="volume" title="Set volume">  
                <span class="volumeBar"></span>  
            </p>  
            <p class="sound sound2 btn" title="Mute/Unmute sound"></p>  
        </p>  
          
    </p>  
    <p class="loading"></p>  
</p>  
  
    <!-- Navigation -->  
    <nav id="navigation">  
        <ul>  
            <li class="currentbtn"><a href="#" title="Demo 1">DEMO 1</a></li>  
            <li><a href="../demo2/" title="Demo 2">DEMO 2</a></li>  
        </ul>  
        <p class="clearfix"></p>      
    </nav>  
</section>  
  
<!-- Footer -->  
<footer>  
    <span>© 2011 <a href="http://www.inwebson.com">inWebson.com</a>. 
    Design by <a href="http://www.inwebson.com/contactus">Kenny Ooi</a>. 
    Powered by <a href="http://www.inwebson.com/html5/">HTML5</a> and 
    <a href="http://www.inwebson.com/jquery/">jQuery</a>.</span>  
</footer>  
</body>  
</html>

style.css

/* video container */  
.videoContainer{  
    width:600px;  
    height:350px;  
    position:relative;  
    overflow:hidden;  
    background:#000;  
    color:#ccc;  
}  
  
/* video caption css */  
.caption{  
    display:none;  
    position:absolute;  
    top:0;  
    left:0;  
    width:100%;  
    padding:10px;  
    color:#ccc;  
    font-size:20px;  
    font-weight:bold;  
    box-sizing: border-box;  
    -ms-box-sizing: border-box;  
    -webkit-box-sizing: border-box;  
    -moz-box-sizing: border-box;  
    background: #1F1F1F; /* fallback */  
    background:-moz-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
    background:-webkit-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
    background:-o-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
}  
  
/*** VIDEO CONTROLS CSS ***/  
/* control holder */  
.control{  
    background:#333;  
    color:#ccc;  
    position:absolute;  
    bottom:0;  
    left:0;  
    width:100%;  
    z-index:5;  
    display:none;  
}  
/* control top part */  
.topControl{  
    height:11px;  
    border-bottom:1px solid #404040;  
    padding:1px 5px;  
    background:#1F1F1F; /* fallback */  
    background:-moz-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
    background:-webkit-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
    background:-o-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
}  
/* control bottom part */  
.btmControl{  
    clear:both;  
    background: #1F1F1F; /* fallback */  
    background:-moz-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
    background:-webkit-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
    background:-o-linear-gradient(top,#242424 50%,#1F1F1F 50%,#171717 100%);  
}  
.control p.btn {  
    float:left;  
    width:34px;  
    height:30px;  
    padding:0 5px;  
    border-right:1px solid #404040;  
    cursor:pointer;  
}  
.control p.text{  
    font-size:12px;  
    font-weight:bold;  
    line-height:30px;  
    text-align:center;  
    font-family:verdana;  
    width:20px;  
    border:none;  
    color:#777;  
}  
.control p.btnPlay{  
    background:url(control.png) no-repeat 0 0;  
    border-left:1px solid #404040;  
}  
.control p.paused{  
    background:url(control.png) no-repeat 0 -30px;  
}  
.control p.btnStop{  
    background:url(control.png) no-repeat 0 -60px;  
}  
.control p.spdText{  
    border:none;  
    font-size:14px;  
    line-height:30px;  
    font-style:italic;  
}  
.control p.selected{  
    font-size:15px;  
    color:#ccc;  
}  
.control p.sound{  
    background:url(control.png) no-repeat -88px -30px;  
    border:none;  
    float:right;  
}  
.control p.sound2{  
    background:url(control.png) no-repeat -88px -60px !important;  
}  
.control p.muted{  
    background:url(control.png) no-repeat -88px 0 !important;  
}  
.control p.btnFS{  
    background:url(control.png) no-repeat -44px 0;  
    float:right;  
}  
.control p.btnLight{  
    background:url(control.png) no-repeat -44px -60px;  
    border-left:1px solid #404040;  
    float:right;  
}  
.control p.lighton{  
    background:url(control.png) no-repeat -44px -30px !important;  
}  
  
/* PROGRESS BAR CSS */  
/* Progress bar */  
.progress {  
    width:85%;  
    height:10px;  
    position:relative;  
    float:left;  
    cursor:pointer;  
    background: #444; /* fallback */  
    background:-moz-linear-gradient(top,#666,#333);  
    background:-webkit-linear-gradient(top,#666,#333);  
    background:-o-linear-gradient(top,#666,#333);  
    box-shadow:0 2px 3px #333 inset;  
    -moz-box-shadow:0 2px 3px #333 inset;  
    -webkit-box-shadow:0 2px 3px #333 inset;  
    border-radius:10px;  
    -moz-border-radius:10px;  
    -webkit-border-radius:10px;  
}  
.progress span {  
    height:100%;  
    position:absolute;  
    top:0;  
    left:0;  
    display:block;  
    border-radius:10px;  
    -moz-border-radius:10px;  
    -webkit-border-radius:10px;  
}  
.timeBar{  
    z-index:10;  
    width:0;  
    background: #3FB7FC; /* fallback */  
    background:-moz-linear-gradient(top,#A0DCFF 50%,#3FB7FC 50%,#16A9FF 100%);  
    background:-webkit-linear-gradient(top,#A0DCFF 50%,#3FB7FC 50%,#16A9FF 100%);  
    background:-o-linear-gradient(top,#A0DCFF 50%,#3FB7FC 50%,#16A9FF 100%);  
    box-shadow:0 0 1px #fff;  
    -moz-box-shadow:0 0 1px #fff;  
    -webkit-box-shadow:0 0 1px #fff;  
}  
.bufferBar{  
    z-index:5;  
    width:0;  
    background: #777;  
    background:-moz-linear-gradient(top,#999,#666);  
    background:-webkit-linear-gradient(top,#999,#666);  
    background:-o-linear-gradient(top,#999,#666);  
    box-shadow:2px 0 5px #333;  
    -moz-box-shadow:2px 0 5px #333;  
    -webkit-box-shadow:2px 0 5px #333;  
}  
/* time and duration */  
.time{  
    width:15%;  
    float:right;  
    text-align:center;  
    font-size:11px;  
    line-height:12px;  
}  
  
/* VOLUME BAR CSS */  
/* volume bar */  
.volume{  
    position:relative;  
    cursor:pointer;  
    width:70px;  
    height:10px;  
    float:right;  
    margin-top:10px;  
    margin-right:10px;  
}  
.volumeBar{  
    display:block;  
    height:100%;  
    position:absolute;  
    top:0;  
    left:0;  
    background-color:#eee;  
    z-index:10;  
}  
  
/* OTHERS CSS */  
/* video screen cover */  
.loading, #init{  
    position:absolute;  
    top:0;  
    left:0;  
    width:100%;  
    height:100%;  
    background:url(loading.gif) no-repeat 50% 50%;  
    z-index:2;  
    display:none;  
}  
#init{  
    background:url(bigplay.png) no-repeat 50% 50% !important;  
    cursor:pointer;  
}

video.js

$(document).ready(function(){  
    //INITIALIZE  
    var video = $(&#39;#myVideo&#39;);  
      
    //remove default control when JS loaded  
    video[0].removeAttribute("controls");  
    $(&#39;.control&#39;).show().css({&#39;bottom&#39;:-45});  
    $(&#39;.loading&#39;).fadeIn(500);  
    $(&#39;.caption&#39;).fadeIn(500);  
   
    //before everything get started  
    video.on(&#39;loadedmetadata&#39;, function() {  
        $(&#39;.caption&#39;).animate({&#39;top&#39;:-45},300);  
              
        //set video properties  
        $(&#39;.current&#39;).text(timeFormat(0));  
        $(&#39;.duration&#39;).text(timeFormat(video[0].duration));  
        updateVolume(0, 0.7);  
              
        //start to get video buffering data   
        setTimeout(startBuffer, 150);  
              
        //bind video events  
        $(&#39;.videoContainer&#39;)  
        .append(&#39;<p id="init"></p>&#39;)  
        .hover(function() {  
            $(&#39;.control&#39;).stop().animate({&#39;bottom&#39;:0}, 500);  
            $(&#39;.caption&#39;).stop().animate({&#39;top&#39;:0}, 500);  
        }, function() {  
            if(!volumeDrag && !timeDrag){  
                $(&#39;.control&#39;).stop().animate({&#39;bottom&#39;:-45}, 500);  
                $(&#39;.caption&#39;).stop().animate({&#39;top&#39;:-45}, 500);  
            }  
        })  
        .on(&#39;click&#39;, function() {  
            $(&#39;#init&#39;).remove();  
            $(&#39;.btnPlay&#39;).addClass(&#39;paused&#39;);  
            $(this).unbind(&#39;click&#39;);  
            video[0].play();  
        });  
        $(&#39;#init&#39;).fadeIn(200);  
    });  
      
    //display video buffering bar  
    var startBuffer = function() {  
        var currentBuffer = video[0].buffered.end(0);  
        var maxduration = video[0].duration;  
        var perc = 100 * currentBuffer / maxduration;  
        $(&#39;.bufferBar&#39;).css(&#39;width&#39;,perc+&#39;%&#39;);  
              
        if(currentBuffer < maxduration) {  
            setTimeout(startBuffer, 500);  
        }  
    };    
      
    //display current video play time  
    video.on(&#39;timeupdate&#39;, function() {  
        var currentPos = video[0].currentTime;  
        var maxduration = video[0].duration;  
        var perc = 100 * currentPos / maxduration;  
        $(&#39;.timeBar&#39;).css(&#39;width&#39;,perc+&#39;%&#39;);      
        $(&#39;.current&#39;).text(timeFormat(currentPos));   
    });  
      
    //CONTROLS EVENTS  
    //video screen and play button clicked  
    video.on(&#39;click&#39;, function() { playpause(); } );  
    $(&#39;.btnPlay&#39;).on(&#39;click&#39;, function() { playpause(); } );  
    var playpause = function() {  
        if(video[0].paused || video[0].ended) {  
            $(&#39;.btnPlay&#39;).addClass(&#39;paused&#39;);  
            video[0].play();  
        }  
        else {  
            $(&#39;.btnPlay&#39;).removeClass(&#39;paused&#39;);  
            video[0].pause();  
        }  
    };  
      
    //speed text clicked  
    $(&#39;.btnx1&#39;).on(&#39;click&#39;, function() { fastfowrd(this, 1); });  
    $(&#39;.btnx3&#39;).on(&#39;click&#39;, function() { fastfowrd(this, 3); });  
    var fastfowrd = function(obj, spd) {  
        $(&#39;.text&#39;).removeClass(&#39;selected&#39;);  
        $(obj).addClass(&#39;selected&#39;);  
        video[0].playbackRate = spd;  
        video[0].play();  
    };  
      
    //stop button clicked  
    $(&#39;.btnStop&#39;).on(&#39;click&#39;, function() {  
        $(&#39;.btnPlay&#39;).removeClass(&#39;paused&#39;);  
        updatebar($(&#39;.progress&#39;).offset().left);  
        video[0].pause();  
    });  
      
    //fullscreen button clicked  
    $(&#39;.btnFS&#39;).on(&#39;click&#39;, function() {  
        if($.isFunction(video[0].webkitEnterFullscreen)) {  
            video[0].webkitEnterFullscreen();  
        }     
        else if ($.isFunction(video[0].mozRequestFullScreen)) {  
            video[0].mozRequestFullScreen();  
        }  
        else {  
            alert(&#39;Your browsers doesn\&#39;t support fullscreen&#39;);  
        }  
    });  
      
    //light bulb button clicked  
    $(&#39;.btnLight&#39;).click(function() {  
        $(this).toggleClass(&#39;lighton&#39;);  
          
        //if lightoff, create an overlay  
        if(!$(this).hasClass(&#39;lighton&#39;)) {  
            $(&#39;body&#39;).append(&#39;<p class="overlay"></p>&#39;);  
            $(&#39;.overlay&#39;).css({  
                &#39;position&#39;:&#39;absolute&#39;,  
                &#39;width&#39;:100+&#39;%&#39;,  
                &#39;height&#39;:$(document).height(),  
                &#39;background&#39;:&#39;#000&#39;,  
                &#39;opacity&#39;:0.9,  
                &#39;top&#39;:0,  
                &#39;left&#39;:0,  
                &#39;z-index&#39;:999  
            });  
            $(&#39;.videoContainer&#39;).css({  
                &#39;z-index&#39;:1000  
            });  
        }  
        //if lighton, remove overlay  
        else {  
            $(&#39;.overlay&#39;).remove();  
        }  
    });  
      
    //sound button clicked  
    $(&#39;.sound&#39;).click(function() {  
        video[0].muted = !video[0].muted;  
        $(this).toggleClass(&#39;muted&#39;);  
        if(video[0].muted) {  
            $(&#39;.volumeBar&#39;).css(&#39;width&#39;,0);  
        }  
        else{  
            $(&#39;.volumeBar&#39;).css(&#39;width&#39;, video[0].volume*100+&#39;%&#39;);  
        }  
    });  
      
    //VIDEO EVENTS  
    //video canplay event  
    video.on(&#39;canplay&#39;, function() {  
        $(&#39;.loading&#39;).fadeOut(100);  
    });  
      
    //video canplaythrough event  
    //solve Chrome cache issue  
    var completeloaded = false;  
    video.on(&#39;canplaythrough&#39;, function() {  
        completeloaded = true;  
    });  
      
    //video ended event  
    video.on(&#39;ended&#39;, function() {  
        $(&#39;.btnPlay&#39;).removeClass(&#39;paused&#39;);  
        video[0].pause();  
    });  
  
    //video seeking event  
    video.on(&#39;seeking&#39;, function() {  
        //if video fully loaded, ignore loading screen  
        if(!completeloaded) {   
            $(&#39;.loading&#39;).fadeIn(200);  
        }     
    });  
      
    //video seeked event  
    video.on(&#39;seeked&#39;, function() { });  
      
    //video waiting for more data event  
    video.on(&#39;waiting&#39;, function() {  
        $(&#39;.loading&#39;).fadeIn(200);  
    });  
      
    //VIDEO PROGRESS BAR  
    //when video timebar clicked  
    var timeDrag = false;   /* check for drag event */  
    $(&#39;.progress&#39;).on(&#39;mousedown&#39;, function(e) {  
        timeDrag = true;  
        updatebar(e.pageX);  
    });  
    $(document).on(&#39;mouseup&#39;, function(e) {  
        if(timeDrag) {  
            timeDrag = false;  
            updatebar(e.pageX);  
        }  
    });  
    $(document).on(&#39;mousemove&#39;, function(e) {  
        if(timeDrag) {  
            updatebar(e.pageX);  
        }  
    });  
    var updatebar = function(x) {  
        var progress = $(&#39;.progress&#39;);  
          
        //calculate drag position  
        //and update video currenttime  
        //as well as progress bar  
        var maxduration = video[0].duration;  
        var position = x - progress.offset().left;  
        var percentage = 100 * position / progress.width();  
        if(percentage > 100) {  
            percentage = 100;  
        }  
        if(percentage < 0) {  
            percentage = 0;  
        }  
        $(&#39;.timeBar&#39;).css(&#39;width&#39;,percentage+&#39;%&#39;);    
        video[0].currentTime = maxduration * percentage / 100;  
    };  
  
    //VOLUME BAR  
    //volume bar event  
    var volumeDrag = false;  
    $(&#39;.volume&#39;).on(&#39;mousedown&#39;, function(e) {  
        volumeDrag = true;  
        video[0].muted = false;  
        $(&#39;.sound&#39;).removeClass(&#39;muted&#39;);  
        updateVolume(e.pageX);  
    });  
    $(document).on(&#39;mouseup&#39;, function(e) {  
        if(volumeDrag) {  
            volumeDrag = false;  
            updateVolume(e.pageX);  
        }  
    });  
    $(document).on(&#39;mousemove&#39;, function(e) {  
        if(volumeDrag) {  
            updateVolume(e.pageX);  
        }  
    });  
    var updateVolume = function(x, vol) {  
        var volume = $(&#39;.volume&#39;);  
        var percentage;  
        //if only volume have specificed  
        //then direct update volume  
        if(vol) {  
            percentage = vol * 100;  
        }  
        else {  
            var position = x - volume.offset().left;  
            percentage = 100 * position / volume.width();  
        }  
          
        if(percentage > 100) {  
            percentage = 100;  
        }  
        if(percentage < 0) {  
            percentage = 0;  
        }  
          
        //update volume bar and video volume  
        $(&#39;.volumeBar&#39;).css(&#39;width&#39;,percentage+&#39;%&#39;);      
        video[0].volume = percentage / 100;  
          
        //change sound icon based on volume  
        if(video[0].volume == 0){  
            $(&#39;.sound&#39;).removeClass(&#39;sound2&#39;).addClass(&#39;muted&#39;);  
        }  
        else if(video[0].volume > 0.5){  
            $(&#39;.sound&#39;).removeClass(&#39;muted&#39;).addClass(&#39;sound2&#39;);  
        }  
        else{  
            $(&#39;.sound&#39;).removeClass(&#39;muted&#39;).removeClass(&#39;sound2&#39;);  
        }  
          
    };  
  
    //Time format converter - 00:00  
    var timeFormat = function(seconds){  
        var m = Math.floor(seconds/60)<10 ? "0"+Math.floor(seconds/60) : Math.floor(seconds/60);  
    var s = Math.floor(seconds-(m*60))<10 ? "0"+Math.floor(seconds-(m*60)) :Math.floor(seconds-(m*60));  
        return m+":"+s;  
    };  
});

Above It's Xiaoqiang's HTML5 mobile development road (5) - the content of making a beautiful video player. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

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HTML5 and H5: Understanding the Common UsageApr 22, 2025 am 12:01 AM

There is no difference between HTML5 and H5, which is the abbreviation of HTML5. 1.HTML5 is the fifth version of HTML, which enhances the multimedia and interactive functions of web pages. 2.H5 is often used to refer to HTML5-based mobile web pages or applications, and is suitable for various mobile devices.

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How to write clean and efficient HTML5 code? The answer is to avoid common mistakes by semanticizing tags, structured code, performance optimization and avoiding common mistakes. 1. Use semantic tags such as, etc. to improve code readability and SEO effect. 2. Keep the code structured and readable, using appropriate indentation and comments. 3. Optimize performance by reducing unnecessary tags, using CDN and compressing code. 4. Avoid common mistakes, such as the tag not closed, and ensure the validity of the code.

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Deconstructing H5 Code: Tags, Elements, and AttributesApr 18, 2025 am 12:06 AM

HTML5 code consists of tags, elements and attributes: 1. The tag defines the content type and is surrounded by angle brackets, such as. 2. Elements are composed of start tags, contents and end tags, such as contents. 3. Attributes define key-value pairs in the start tag, enhance functions, such as. These are the basic units for building web structure.

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HTML5 is a key technology for building modern web pages, providing many new elements and features. 1. HTML5 introduces semantic elements such as, , etc., which enhances web page structure and SEO. 2. Support multimedia elements and embed media without plug-ins. 3. Forms enhance new input types and verification properties, simplifying the verification process. 4. Offer offline and local storage functions to improve web page performance and user experience.

H5 Code: Best Practices for Web DevelopersApr 16, 2025 am 12:14 AM

Best practices for H5 code include: 1. Use correct DOCTYPE declarations and character encoding; 2. Use semantic tags; 3. Reduce HTTP requests; 4. Use asynchronous loading; 5. Optimize images. These practices can improve the efficiency, maintainability and user experience of web pages.

H5: The Evolution of Web Standards and TechnologiesApr 15, 2025 am 12:12 AM

Web standards and technologies have evolved from HTML4, CSS2 and simple JavaScript to date and have undergone significant developments. 1) HTML5 introduces APIs such as Canvas and WebStorage, which enhances the complexity and interactivity of web applications. 2) CSS3 adds animation and transition functions to make the page more effective. 3) JavaScript improves development efficiency and code readability through modern syntax of Node.js and ES6, such as arrow functions and classes. These changes have promoted the development of performance optimization and best practices of web applications.

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