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Att Iframe Longdesc
Att Iframe Longdesc
π 2026-06-14 | π HTML
# HTML
`longdesc` Attribute The `longdesc` attribute of the `
` tag was designed to provide a link to a separate document containing a long description of the iframe's content. This was primarily intended for accessibility purposes, helping users with visual impairments understand the embedded content via screen readers. --- ## Deprecation Notice > β οΈ **Important:** The `longdesc` attribute is **deprecated in HTML5** and is no longer supported by modern web standards. Due to extremely poor browser support, you should avoid using this attribute in modern web development. Alternative solutions are provided below. --- ## Syntax ```html
``` ### Attribute Values | Value | Description | | :--- | :--- | | `URL` | Specifies the URL of the page containing the long description of the `
` content.
**Possible values:**
β’ **Absolute URL:** Points to another website (e.g., `longdesc="https://www.example.com/desc.txt"`)
β’ **Relative URL:** Points to a file within the same website (e.g., `longdesc="descriptions/iframe-desc.html"`) | --- ## Code Example Below is an example of how the `longdesc` attribute was historically implemented: ```html
Your browser does not support iframes.
``` --- ## Browser Support | Chrome | Edge/IE | Firefox | Safari | Opera | | :---: | :---: | :---: | :---: | :---: | | β Not Supported | β Not Supported | β Not Supported | β Not Supported | β Not Supported | Almost all mainstream modern web browsers do not support or have dropped support for the `longdesc` attribute. --- ## Modern Alternatives Since `longdesc` is obsolete, you should use modern, accessible alternatives to describe iframe content: ### 1. Use the `title` Attribute (Recommended) For short descriptions, always include a descriptive `title` attribute on your `
`. Screen readers read this title to let users know what the iframe contains. ```html
``` ### 2. Provide a Visible Text Link If a detailed, long description is necessary, place a standard text link near the iframe. This ensures the description is accessible to all users, regardless of the browser or assistive technology they use. ```html
Read a detailed text description of this data visualization.
``` ### 3. Use ARIA Attributes You can use `aria-describedby` to point to an element on the same page that contains the description. ```html
This chart illustrates a 15% increase in annual subscription renewals over the past fiscal year.
```
β Att Iframe Marginheight
Att Iframe Height β
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