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# HTML onmouseout Event Attribute The `onmouseout` event attribute fires when the mouse pointer moves out of (leaves) an element. It is a widely used mouse event in web development for creating interactive user interfaces, such as dropdown menus, tooltips, and image hover effects. --- ## Browser Support The `onmouseout` attribute is fully supported by all major modern web browsers: * Google Chrome * Mozilla Firefox * Microsoft Edge * Safari * Opera --- ## Definition and Usage The `onmouseout` attribute is triggered when a user moves the mouse cursor away from the element that has the attribute. ### Differences Between HTML 4.01 and HTML5 There are no differences in the behavior or support of this attribute between HTML 4.01 and HTML5. ### Unsupported Elements The `onmouseout` attribute is a global event attribute, but it **cannot** be used with the following HTML elements: * `` * `` * `
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