代码编辑器：
x
1
2
<meta charset="utf-8"> 3
<div style="text-align:center"> 4
<button onclick="playPause()">播放/暂停</button> 5
<button onclick="makeBig()">放大</button>6
<button onclick="makeSmall()">缩小</button>7
<button onclick="makeNormal()">普通</button>8
<br>9
<br/>10
<video id="video1" width="420">11
<source src="/static/i/html/html_video_2.mp4" type="video/mp4">12
<source src="/static/i/html/html_video_2.ogg" type="video/ogg">13
您的浏览器不支持 HTML5 video 标签。14
</video>15
</div> 16
<script> 17
var myVideo=document.getElementById("video1"); 18