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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/ElementInternals/ariaPlaceholder below:

ElementInternals: ariaPlaceholder property - Web APIs

Baseline 2023

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The ariaPlaceholder property of the ElementInternals interface reflects the value of the aria-placeholder attribute, which defines a short hint intended to aid the user with data entry when the control has no value.

Note: Setting aria attributes on ElementInternals allows default semantics to be defined on a custom element. These may be overwritten by author-defined attributes, but ensure that default semantics are retained should the author delete those attributes, or fail to add them at all. For more information see the Accessibility Object Model explainer.

A string.

In this example the value of ariaPlaceholder is set to "12345".

class CustomControl extends HTMLElement {
  constructor() {
    super();
    this.internals_ = this.attachInternals();
    this.internals_.ariaPlaceholder = "12345";
  }
  // …
}

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