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Att Video Height
Att Video Height
π 2026-06-14 | π HTML
# HTML
height Attribute The HTML `
` `height` attribute is used to specify the height of the video player in pixels. This tutorial provides a comprehensive reference for the `height` attribute, including syntax, browser compatibility, practical examples, and best practices for modern web development. --- ## Introduction When embedding video content into a web page using the HTML5 `
` element, defining the dimensions of the player is crucial. The `height` attribute explicitly sets the vertical dimension of the video player. Setting both `width` and `height` attributes ensures that the browser can allocate the correct amount of space for the video before it loads, preventing layout shifts (CLS - Cumulative Layout Shift) during page rendering. --- ## Syntax ```html
``` ### Attribute Values | Value | Description | | :--- | :--- | | *pixels* | The height of the video player in pixels (e.g., `240` or `"240"`). | *Note: In HTML5, the value must be an integer representing pixels. Percentage values (e.g., `50%`) are not valid for the HTML `height` attribute; if you need responsive sizing, use CSS instead.* --- ## Code Example Below is a standard implementation of a video player with defined `width` and `height` attributes: ```html
Your browser does not support the video tag.
``` --- ## Browser Support The `height` attribute of the `
` tag is universally supported by all modern web browsers: * Google Chrome * Microsoft Edge / Internet Explorer 9+ * Mozilla Firefox * Safari * Opera *Note: Internet Explorer 8 and earlier versions do not support the `
` tag or its attributes.* --- ## Key Considerations & Best Practices ### 1. Preventing Layout Shifts It is highly recommended to always specify both `width` and `height` attributes. When these attributes are set, the browser reserves the required space for the video 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. ### 2. Avoid Using Attributes for Video Compression Do not use the `width` and `height` attributes to scale down a large video file. For example, setting a $1920 \times 1080$ video to `width="320" height="180"` only changes its visual display size; the user still has to download the full, heavy high-definition file. * **Best Practice:** Use video editing or transcoding software (like FFmpeg or Handbrake) to compress and resize the video to the actual dimensions you want to display before uploading it to your server. ### 3. Responsive Video Sizing with CSS While the HTML `height` attribute only accepts pixel values, modern responsive web design often requires fluid video players. To make a video responsive, omit the HTML `height` attribute (or set it as a fallback) and use CSS: ```css video { width: 100%; height: auto; /* Maintains the original aspect ratio */ max-width: 640px; /* Prevents the video from scaling up too large */ } ```
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