Web features explorer - HTML processing instructions

Web features explorer

An HTML processing instruction is text enclosed by <? and >, which marks a target for further processing. They may appear anywhere in a document. They are ignored like comments when they're not recognized for a specific purpose.

Browser support

Chrome 150 Released on 2026-06-30
Chrome Android 150 Released on 2026-06-30
Edge 150 Released on 2026-07-02
Firefox Not supported
Firefox for Android Not supported
Safari Not supported
Safari on iOS Not supported

MDN documentation

No MDN documentation found. You can search for the feature on MDN. If you believe that MDN has no documentation about this feature, you can open an issue on MDN's GitHub repository.

Specifications

HTML (#processing-instructions), from HTML Workstream (WHATWG).

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