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✗The headingoffset HTML attribute offsets the heading level of descendant <h1>–<h6> elements. The headingreset HTML attribute prevents heading offset computation from traversing beyond the element. Shipping in Safari 27.3 (beta). Probes HTMLElement.headingReset, HTMLElement.headingOffset. More: developer.mozilla.org/docs/Web/HTML/Reference/Glob… html.spec.whatwg.org/multipage/sections.html#headi… web-platform-dx.github.io/web-features-explorer/fe…
(typeof HTMLElement !== "undefined" && "headingReset" in (HTMLElement.prototype || HTMLElement)) && (typeof HTMLElement !== "undefined" && "headingOffset" in (HTMLElement.prototype || HTMLElement))(typeof HTMLElement !== "undefined" && "headingReset" in (HTMLElement.prototype || HTMLElement)) && (typeof HTMLElement !== "undefined" && "headingOffset" in (HTMLElement.prototype || HTMLElement))
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