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The HTMLOrForeignElement mixin describes several features common to the HTMLElement, SVGElement and MathMLElement interfaces. Each of these interfaces can, of course, add more features in addition to the ones listed below.

Note: HTMLOrForeignElement is a mixin and not an interface; you can't actually create an object of type HTMLOrForeignElement.

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dataset undefined
The dataset read-only property of the HTMLOrForeignElement mixin provides read/write access to custom data attributes (data-*) on elements.
nonce This is an experimental API that should not be used in production code.
The nonce property of the HTMLOrForeignElement mixin returns the cryptographic number used once that is used by Content Security Policy to determine whether a given fetch will be allowed to proceed.
The tabIndex property of the HTMLOrForeignElement mixin represents the tab order of the current element.
The HTMLElement.blur() method removes keyboard focus from the current element.
The HTMLElement.focus() method sets focus on the specified element, if it can be focused. The focused element is the element which will receive keyboard and similar events by default.
Specification Status Comment
HTML Living Standard
The definition of 'HTMLOrForeignElement' in that specification.
Living Standard Initial definition.