This specific inquiry (which points to this particular post) examines the execution of arbitrary JavaScript invoked from a CSS file through various workarounds in IE and Firefox, such as utilizing expression(). (A commenter noted that these techniques are referred to as XBL in Firefox and HTC in IE)
Is there a way to achieve the same functionality (running potentially harmful JS from CSS) in Chrome using only client-side code and native methods, without relying on external libraries?
In modern browsers, using JavaScript within CSS is not possible except through currently supported URL parameters like `background-image`, which can execute scripts if a `javascript:` URL is used.
While it was once possible to use `moz-binding` in Firefox 2 & 3, support for this feature was later dropped in future versions due to identified flaws being mitigated.
Since Internet Explorer 10, HTML Components have not been supported, making developing websites reliant on this technology pointless.
CSS Expressions are only supported in IE5/7 quirks/standards mode respectively.
If you're trying to create an exploit or fulfill a functional requirement with CSS, consider focusing on URL parameters or transitioning into JavaScript. You may also be able to manipulate the UI to deceive users into thinking injected site content is legitimate. However, if your goal is the latter, it's best to explore alternative methods instead of forcing CSS to enable script execution.
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