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Att Object Width

📅 2026-06-14 | 📂 HTML
## HTML <object> width Attribute The `width` attribute of the `` tag specifies the horizontal width of an embedded object in pixels. The `` element is used to embed multimedia, external resources, or interactive content (such as PDFs, Flash animations, audio, video, or nested HTML documents) directly into an HTML page. --- ## Browser Support The `width` attribute is universally supported across all major modern web browsers: * Google Chrome * Mozilla Firefox * Microsoft Edge / Internet Explorer * Safari * Opera --- ## Definition and Usage The `width` attribute defines the display width of the container holding the embedded resource. ### HTML 4.01 vs. HTML5 Differences * **HTML 4.01:** Allowed the width to be specified in either pixels or as a percentage of the containing element (e.g., `width="50%"`). * **HTML5:** Only supports values in **pixels**. Percentage values should be handled via CSS instead. --- ## Syntax ```html ``` ### Attribute Values | Value | Description | | :--- | :--- | | *pixels* | Specifies the width of the object in pixels (e.g., `width="400"`). Do not append "px" to the value; use numbers only. | --- ## Code Examples ### Example 1: Embedding a PDF Document This example embeds a PDF document with a defined width and height of 500 pixels. ```html

Your browser does not support PDFs. Download the PDF instead.

 ``` ### Example 2: Embedding a Flash Animation (Legacy) Historically, the `` tag was widely used to embed Flash (`.swf`) files. ```html

Flash content is no longer supported in modern browsers.

 ``` --- ## Best Practices and Considerations 1. **Always Provide Fallback Content:** Always include alternative text or HTML inside the `` tags. If the browser does not support the specified media type or fails to load the resource, it will render the fallback content. 2. **Use CSS for Responsive Design:** While the `width` attribute is useful for setting a fixed size, modern web development favors CSS for responsive layouts. You can override or set the width using CSS: ```css object { width: 100%; max-width: 600px; height: auto; } ``` 3. **Pair with Height:** It is highly recommended to use the `width` attribute in tandem with the `height` attribute to maintain the correct aspect ratio and prevent layout shifts while the page loads.
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