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- </a> </li> <li class=""> <a href="/jiaocheng/co-1055.html"> <img></a> </li> <li class=""> <a href="/jiaocheng/co-1056.html"> <input></a> </li> <li class=""> <a href="/jiaocheng/co-1057.html"> <ins></a> </li> <li class=""> <a href="/jiaocheng/co-1058.html"> <kbd></a> </li> <li class=""> <a href="/jiaocheng/co-1059.html"> <keygen></a> </li> <li class=""> <a href="/jiaocheng/co-1060.html"> <label></a> </li> <li class=""> <a href="/jiaocheng/co-1061.html"> <legend></a> </li> <li class=""> <a href="/jiaocheng/co-1062.html"> <li></a> </li> <li class=""> <a href="/jiaocheng/co-1063.html"> <link></a> </li> <li class=""> <a href="/jiaocheng/co-1064.html"><main></a> </li> <li class=""> <a href="/jiaocheng/co-1065.html"> <map></a> </li> <li class=""> <a href="/jiaocheng/co-1066.html"> <mark></a> </li> <li class=""> <a href="/jiaocheng/co-1067.html"> <menu></a> </li> <li class=""> <a href="/jiaocheng/co-1068.html"> <meta></a> </li> <li class=""> <a href="/jiaocheng/co-1069.html"> <meter></a> </li> <li class=""> <a href="/jiaocheng/co-1070.html"> <nav></a> </li> <li class=""> <a href="/jiaocheng/co-1071.html"> <noframes></a> </li> <li class=""> <a href="/jiaocheng/co-1072.html"> <noscript></a> </li> <li class=""> <a href="/jiaocheng/co-1073.html"> <object></a> </li> <li class=""> <a href="/jiaocheng/co-1074.html"> <ol></a> </li> <li class=""> <a href="/jiaocheng/co-1075.html"> <optgroup></a> </li> <li class=""> <a href="/jiaocheng/co-1076.html"> <option></a> </li> <li class=""> <a href="/jiaocheng/co-1077.html"> <output></a> </li> <li class=""> <a href="/jiaocheng/co-1078.html"> <p></a> </li> <li class=""> <a href="/jiaocheng/co-1079.html"> <param></a> </li> <li class=""> <a href="/jiaocheng/co-1080.html"> <pre></a> </li> <li class=""> <a href="/jiaocheng/co-1081.html"> <html></a> </li> <li class=""> <a href="/jiaocheng/co-1082.html"><picture></a> </li> <li class=""> <a href="/jiaocheng/co-1083.html">progress</a> </li> <li class=""> <a href="/jiaocheng/co-1084.html">q </a> </li> <li class=""> <a href="/jiaocheng/co-1085.html"> <rp></a> </li> <li class=""> <a href="/jiaocheng/co-1086.html"> <rt></a> </li> <li class=""> <a href="/jiaocheng/co-1087.html"> <ruby></a> </li> <li class=""> <a href="/jiaocheng/co-1088.html"> <s></a> </li> <li class=""> <a href="/jiaocheng/co-1089.html"> <samp></a> </li> <li class=""> <a href="/jiaocheng/co-1090.html"><script> </a> </li> <li class=""> <a href="/jiaocheng/co-1091.html"> <section></a> </li> <li class=""> <a href="/jiaocheng/co-1092.html"> <select></a> </li> <li class=""> <a href="/jiaocheng/co-1093.html"> <small></a> </li> <li class=""> <a href="/jiaocheng/co-1094.html"> <source></a> </li> <li class=""> <a href="/jiaocheng/co-1095.html"> <span></a> </li> <li class=""> <a href="/jiaocheng/co-1096.html"> <strike></a> </li> <li class=""> <a href="/jiaocheng/co-1097.html"> <strong></a> </li> <li class=""> <a href="/jiaocheng/co-1098.html"> <style></a> </li> <li class=""> <a href="/jiaocheng/co-1099.html"> <sub></a> </li> <li class=""> <a href="/jiaocheng/co-1100.html"> <summary></a> </li> <li class=""> <a href="/jiaocheng/co-1101.html"> <sup></a> </li> <li class=""> <a href="/jiaocheng/co-1102.html"> <table></a> </li> <li class=""> <a href="/jiaocheng/co-1103.html"> <tbody></a> </li> <li class=""> <a href="/jiaocheng/co-1104.html"> <td></a> </li> <li class=""> <a href="/jiaocheng/co-1105.html"> <textarea></a> </li> <li class=""> <a href="/jiaocheng/co-1106.html"> <tfoot></a> </li> <li class=""> <a href="/jiaocheng/co-1107.html"> <th></a> </li> <li class=""> <a href="/jiaocheng/co-1108.html"> <thead></a> </li> <li class=""> <a href="/jiaocheng/co-1109.html"> <time></a> </li> <li class=""> <a href="/jiaocheng/co-1110.html"> <title></a> </li> <li class=""> <a href="/jiaocheng/co-1111.html"> <tr></a> </li> <li class=""> <a href="/jiaocheng/co-1112.html"> <track></a> </li> <li class=""> <a href="/jiaocheng/co-1113.html"> <tt></a> </li> <li class=""> <a href="/jiaocheng/co-1114.html"> <u></a> </li> <li class=""> <a href="/jiaocheng/co-1115.html"> <ul></a> </li> <li class=""> <a href="/jiaocheng/co-1116.html"> <var></a> </li> <li class=""> <a href="/jiaocheng/co-1117.html"> <video></a> </li> <li class=""> <a href="/jiaocheng/co-1118.html"> <wbr></a> </li> </ul> </div>  <div id='write' class='is-node'> <h1 class="border-b-none"><a name="" class="md-header-anchor"></a><span>HTML <track> default 属性</span></h1> <div class="pre-and-next"> <a href="co-4646.html">上一篇：HTML <tr> valign 属性</a> <a href="co-4648.html" >下一篇：HTML <track> kind 属性 </a> </div> <div class="article-intro" id="content"><p><a href="co-1112.html"><img alt="HTML track 标签参考手册" class="navup" src="/uploadfile/up/3e/a9/18/41e5761fb9ace3ecbd611c59b218a93e.jpg"/> HTML <track> 标签</a></p><div class="example"> <h2 class="example">实例</h2> <p>下面是一个 video 元素，其中的两个字幕之一是默认的：</p> <div class="example_code notranslate"> <video width="320" height="240" controls><br/> <source src="forrest_gump.mp4" type="video/mp4"><br/> <source src="forrest_gump.ogg" type="video/ogg"><br/> <track src="subtitles_en.vtt" kind="subtitles" srclang="en"<br/> label="English" default><br/> <track src="subtitles_no.vtt" kind="subtitles" srclang="no"<br/> label="Norwegian"><br/> </video> </div> </div><hr/><h2>浏览器支持</h2><p> <img alt="Internet Explorer" height="30" src="/uploadfile/up/4e/a4/5d/6de56157646f895dc3df5461415da44e.jpg" title="Internet Explorer" width="31"/><img alt="Firefox" height="30" src="../uploadfile/up/71/f5/a5/a5e012111db559e0ae3bea292fa5f571.jpg" title="Firefox" width="31"/><img alt="Opera" height="30" src="/uploadfile/up/6f/c9/2f/2fde4bf7adb5ab30bcc93bcca92fc96f.jpg" title="Opera" width="28"/><img alt="Google Chrome" height="30" src="/uploadfile/up/6a/8e/5a/cb756c591b627ba35012a37de65a8e6a.jpg" title="Google Chrome" width="31"/><img alt="Safari" height="30" src="../uploadfile/up/dc/df/e5/a51269656b1eafff4ae1bbe6a8e5dfdc.jpg" title="Safari" width="28"/></p><p>Internet Explorer 10, Opera, 和 Chrome 支持 default 属性。</p><hr/><h2>定义和用法</h2><p>default 属性是一个 boolean（布尔）属性。</p><p>如果使用 default 属性，则规定应该使用该轨道，假如用户没有选择其他轨道的话。</p><hr/><h2>HTML 4.01 与 HTML5之间的差异</h2><p><track> 标签是 HTML5 新标签。</p><hr/><h2>HTML 与 XHTML之间的差异</h2><p>在 XHTML 中, 属性不允许简介， default 属性必须定义为： <track default="default" />。 </p><hr/><h2>语法</h2><div class="code notranslate"><div> <track src="subtitles_en.vtt" default> </div></div><hr/><a href="co-1112.html"><img alt="HTML track 标签参考手册" class="navup" src="/uploadfile/up/3e/a9/18/41e5761fb9ace3ecbd611c59b218a93e.jpg"/> HTML <track> 标签</a>其他扩展</div> <div class="pre-and-next"> <a href="co-4646.html">上一篇：HTML <tr> valign 属性</a> <a href="co-4648.html" >下一篇：HTML <track> kind 属性 </a> </div> </div> <div class="right-nav-con" id="rightNavCon"> <ul id="rightNavList"> <li><strong>分类导航</strong></li> <li data-type="dropdown"> <a href="javascript:;">HTML/CSS  <i class="opacity-5 fa fa-angle-down" aria-hidden="true"></i> </a> <dl class="height-0"> <dd><a href="/jiaocheng/bootstrap/" class="">Bootstrap 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