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# The “icon” element is a completely-unknown element that is not allowed anywhere in any HTML content. > Canonical HTML version: https://rocketvalidator.com/html-validation/the-icon-element-is-a-completely-unknown-element-that-is-not-allowed-anywhere-in-any-html-content > Attribution: Rocket Validator (https://rocketvalidator.com) > License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) The `` element does not exist in HTML. No version of the HTML specification defines it, and browsers do not recognize it. This error appears when markup includes `` as if it were a standard HTML element. It is not. Browsers will treat it as an unknown inline element with no default behavior or semantics. To display icons, use an `` element, an `` with CSS-applied background images or icon fonts. If the intent is to define a favicon (the small icon shown in browser tabs), the correct approach is a `` element inside `` with `rel="icon"`. ## HTML examples ### Invalid: using the `` element ```html My page ``` ### Valid: using a `` element for a favicon ```html My page ``` ### Valid: displaying an icon inline with `` ```html

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``` ### Valid: displaying an icon inline with `` and CSS ```html

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