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

MathMLElement: tabIndex property - Web APIs

Baseline 2023

Newly available

The tabIndex property of the MathMLElement interface represents the tab order of the current MathML element.

Tab order is as follows:

1. Elements with a positive tabIndex. Elements that have identical tabIndex values should be navigated in the order they appear. Navigation proceeds from the lowest tabIndex to the highest tabIndex.
2. Elements that do not support the tabIndex attribute or support it and assign tabIndex to 0, in the order they appear.

Elements that are disabled do not participate in the tabbing order. Values don't need to be sequential, nor must they begin with any particular value. They may even be negative, though each browser trims very large values.

An integer.

<math id="math1" tabindex="2">
  <msup>
    <mi>a</mi>
    <mn>2</mn>
  </msup>
</math>

<math id="math2">
  <mfrac>
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
</math>

const math1 = document.getElementById("math1");
const math2 = document.getElementById("math2");

// Access and modify the tabIndex
console.log(math1.tabIndex); // 2
math2.tabIndex = 1; // Add math2 to the tab order before math1

// Programmatically focus on an element with negative tabIndex
math1.tabIndex = -1;
math1.focus(); // Works, even though it is not in the tabbing order

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