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Att Video Width
Att Video Width
π 2026-06-14 | π HTML
# HTML
width Attribute The `width` attribute of the `
` tag is used to specify the display width of the video player in pixels. Setting this attribute ensures that the browser can allocate the correct amount of space for the video before it loads, preventing layout shifts. --- ## Browser Support The `width` attribute is universally supported by all modern web browsers: * Google Chrome * Mozilla Firefox * Safari * Opera * Microsoft Edge / Internet Explorer 9+ *Note: The `
` tag and its attributes are not supported in Internet Explorer 8 and earlier versions.* --- ## Definition and Usage The `width` attribute defines the horizontal dimension of the video playback area. ### Why You Should Always Set Width and Height It is highly recommended to always specify both the `width` and `height` attributes for your video elements. * **Prevents Layout Shifts:** When these dimensions are set, the browser reserves the required space for the video player while the page is loading. Without them, the browser cannot determine the video's dimensions beforehand, causing the page layout to jump or shift once the video metadata loads. * **Improves User Experience:** Reserving space prevents content from jumping around, which directly improves your website's Cumulative Layout Shift (CLS) web vital metric. --- ## Syntax ```html
``` ### Attribute Values | Value | Description | | :--- | :--- | | *pixels* | Specifies the width of the video player in pixels (e.g., `320` or `"320"`). | --- ## Code Examples ### Basic Example The following example demonstrates a video player with a defined width of 320 pixels and a height of 240 pixels: ```html
Your browser does not support the video tag.
``` ### Responsive Video with CSS While the HTML `width` attribute accepts only pixel values, you can use CSS to make your video responsive across different screen sizes: ```html
Your browser does not support the video tag.
``` --- ## Important Considerations * **Do Not Use Attributes for Downscaling:** Avoid using the `width` and `height` attributes to scale down a large video file to fit a small space. Even if the video appears small on the screen, the user still has to download the full-sized, heavy video file. Always compress and resize the video file itself using video editing software before uploading it to your website. * **Aspect Ratio:** If you set both `width` and `height`, the video player box will match those dimensions. However, the video content itself will maintain its original aspect ratio and will be letterboxed (black bars on the top/bottom or sides) inside the player element if the aspect ratios do not match. You can control this behavior using the CSS `object-fit` property.
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