add native video test page

test.html

@@ -0,0 +1,15 @@
+<!doctype html><html><head><meta charset="utf-8"><title>video test</title></head>
+<body style="background:#111;color:#eee;font-family:sans-serif;padding:20px">
+<h3>原生 &lt;video&gt; 测试(无自定义JS)</h3>
+<p>点下面播放器的播放键。能播=交付没问题;黑=编码/交付问题。</p>
+<video src="ep1/video/head_front_color.mp4" controls muted playsinline style="width:640px;background:#000"></video>
+<hr>
+<h4>data URI 内联测试(同一个视频)</h4>
+<video id="v2" controls muted playsinline style="width:640px;background:#000"></video>
+<script>
+// 抓取并转data URI,验证内联是否能播
+fetch('ep1/video/head_front_color.mp4').then(r=>r.blob()).then(b=>{
+  document.getElementById('v2').src=URL.createObjectURL(b);
+}).catch(e=>document.body.insertAdjacentHTML('beforeend','<p style="color:red">fetch失败:'+e+'</p>'));
+</script>
+</body></html>