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

ElementInternals: ariaRowCount property - Web APIs

Baseline 2023

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The ariaRowCount property of the ElementInternals interface reflects the value of the aria-rowcount attribute, which defines the total number of rows in a table, grid, or treegrid.

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 which contains an integer.

In this example the value of ariaRowCount is set to "100".

class CustomEl extends HTMLElement {
  constructor() {
    super();
    this.internals_ = this.attachInternals();
    this.internals_.ariaRowCount = "100";
  }
  // …
}

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