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## HTML ` ``` ### XHTML Differences In XHTML, attribute minimization is forbidden. The `seamless` attribute must be defined with its value explicitly declared: ```xml ``` --- ## Browser Support and Modern Status | Feature | Chrome | Edge | Firefox | Safari | Opera | | :--- | :--- | :--- | :--- | :--- | :--- | | `seamless` Attribute | Not Supported | Not Supported | Not Supported | Not Supported | Not Supported | > ### ⚠️ Important Modern Web Note > While the `seamless` attribute was introduced in the original HTML5 specification and briefly supported in early versions of WebKit-based browsers (like Chrome and Safari 6), **it has since been removed from the living HTML standard**. > > Modern browsers no longer support the `seamless` attribute. ### Modern Alternatives (CSS Solution) To achieve the exact same visual effect as the `seamless` attribute in modern web development, you should use CSS. You can remove borders, manage scrollbars, and size the iframe dynamically using the following CSS rules: ```css iframe.seamless-fallback { border: none; /* Removes the default border */ width: 100%; /* Makes it span the full width of the container */ height: auto; /* Adjust height as needed */ overflow: hidden; /* Prevents scrollbars */ } ``` ```html ```