哪些屬性用於控制HTML視頻元素的顯示和播放？

要控制HTML <video> 元素的顯示和播放，需使用一系列屬性。 1. 基礎播放控制：src指定視頻URL，controls添加默認控件，autoplay實現自動播放（通常需配合muted），loop循環播放，muted默認靜音；2. 顯示與佈局：width/height設置尺寸，poster定義預覽圖，preload控制加載策略；3. 高級行為與兼容性：playsinline允許iOS內聯播放，<source>標籤提供多格式支持以確保跨瀏覽器兼容性。

To control the display and playback of an HTML <video></video> element, you use a combination of attributes directly on the <video></video> tag. These attributes let you define how the video behaves when it loads and plays in the browser.

Here are the key attributes grouped by what they control:

Basic Playback Control Attributes

These affect how and when the video starts playing.

• src : Specifies the URL of the video file.
• controls : Adds the browser's default video controls (play, pause, volume, etc.).
• autoplay : Makes the video start playing as soon as it's ready (may be blocked by browsers for auto-play policies).
• loop : Causes the video to restart automatically after reaching the end.
• muted : Mutes the audio output by default.

Example:

 <video src="example.mp4" controls autoplay loop muted></video>

Browsers often require muted along with autoplay to allow automatic playback without user interaction.

Display and Layout Attributes

These help manage the visual appearance and layout behavior of the video.

• width / height : Sets the size of the video player (can also be controlled via CSS).
• poster : Displays an image while the video is downloading or until the user hits play.
• preload : Hints to the browser whether to load the video when the page loads ( auto , metadata , or none ).

Tips:

• Use poster to show a preview frame instead of a blank screen.
• preload="metadata" is often a good middle ground — it loads just enough to get duration and dimensions.

Advanced Behavior and Compatibility

For more flexibility and support across devices:

• playsinline : On iOS, allows the video to play within the webpage rather than full-screen mode.
• <source> elements inside <video> : Used to provide multiple video formats for cross-browser compatibility.

Example using multiple sources:

 <video controls>
<source src="movie.mp4" type="video/mp4">
<source src="movie.webm" type="video/webm">
Your browser does not support the video tag.
</video>

This ensures broader support since not all browsers support the same video formats.

You don't need to use all these attributes every time — just the ones that match your needs. But knowing which one does what helps you build reliable, user-friendly video experiences on the web.

基本上就這些。

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