＆lt; video＆gt;を使用して、HTMLにビデオをどのように埋め込みますか タグ？

How do you embed video in HTML using the <video> tag?

To embed a video in HTML using the <video> tag, you can use the following basic structure:

<video width="320" height="240" controls>
  <source src="video.mp4" type="video/mp4">
  Your browser does not support the video tag.
</video>

In this example:

• The width and height attributes define the size of the video player.
• The controls attribute adds play, pause, and volume controls.
• The <source> tag inside the <video> element specifies the video file to be played. The src attribute points to the video file, and the type attribute indicates the MIME type of the resource.
• The text "Your browser does not support the video tag" serves as fallback content in case the browser does not support the <video> element.

What are the essential attributes for the <video> tag to ensure cross-browser compatibility?

To ensure cross-browser compatibility when using the <video> tag, you should consider the following essential attributes:

1. src: Specifies the URL of the video file. While you can use this attribute directly on the <video> tag, it's better to use it within the <source> element to offer multiple video formats.
2. type: Used with the <source> element to indicate the MIME type of the video file. This helps browsers determine which source to use.
3. controls: Adds basic video controls like play, pause, and volume. It's good practice to include this attribute for usability, though you can design custom controls if needed.
4. width and height: Set the dimensions of the video player. These can help prevent layout shifts while the video loads.
5. preload: Specifies how the video should be preloaded. Options include none (no preloading), metadata (only metadata like duration), or auto (load the entire video). This can affect performance and user experience.
6. poster: Specifies an image to be shown while the video is downloading or until the user hits the play button.

By using these attributes, you can enhance the compatibility of your video across different browsers.

Can you list common video formats supported by the <video> tag and how to specify them?

Common video formats supported by the <video> tag include:

1. MP4: Widely supported across modern browsers. To specify an MP4 file, use:

   <source src="video.mp4" type="video/mp4">

2. WebM: Supported by Chrome, Firefox, Opera, and Edge. To specify a WebM file, use:

   <source src="video.webm" type="video/webm">

3. Ogg: Supported by Firefox, Opera, and some older versions of Chrome. To specify an Ogg file, use:

   <source src="video.ogv" type="video/ogg">

To ensure broader compatibility, you can list multiple <source> elements inside the <video> tag, allowing the browser to select the first supported format:

<video width="320" height="240" controls="">
  <source src="video.mp4" type="video/mp4">
  <source src="video.webm" type="video/webm">
  <source src="video.ogv" type="video/ogg">
  Your browser does not support the video tag.
</video>

How do you add subtitles or captions to a video embedded with the <video> tag?

To add subtitles or captions to a video embedded with the <video> tag, you can use the <track> element. Here's how:

<video width="320" height="240" controls="">
  <source src="video.mp4" type="video/mp4">
  <track src="captions.vtt" kind="subtitles" srclang="en" label="English">
  Your browser does not support the video tag.
</video>

In this example:

• The src attribute of the <track> element points to the WebVTT (Web Video Text Tracks) file containing the subtitles or captions.
• The kind attribute specifies the type of text track. Options include subtitles, captions, descriptions, chapters, and metadata. For subtitles or captions, use subtitles or captions.
• The srclang attribute indicates the language of the text track (e.g., en for English).
• The label attribute provides a user-readable title for the text track, which can be displayed in a menu to select different subtitles.

To ensure that the subtitles or captions appear, make sure the video player supports them (modern browsers do), and that the WebVTT file is correctly formatted. For example, a basic WebVTT file might look like this:

<code>WEBVTT

00:00:00.000 --> 00:00:05.000
Hello, welcome to my video!

00:00:05.001 --> 00:00:10.000
Today we'll be discussing how to use the video tag.</code>

This will display the corresponding text at the specified times during the video playback.

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