（html）【學習記錄】插入一個bilibili視頻，等比例縮放，不被拉伸，高清播放，支持彈幕

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<div style="position: relative; padding: 30% 45%;">
<iframe src="//player.bilibili.com/player.html?aid=100456428&cid=171311599&page=1&as_wide=1&high_quality=1&danmaku=" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true" style="position: absolute; width: 100%; height: 100%; left: 0; top: 0;"> </iframe>
</div>
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