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web api instance property

MathMLElement: dataset property

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The dataset read-only property of the MathMLElement interface provides read/write access to custom data attributes (data-*) on elements. It exposes a map of strings (DOMStringMap) with an entry for each data-* attribute.

The dataset property itself can be read, but not directly written. Instead, all writes must be to the individual properties within the dataset, which in turn represent the data attributes.

Value

A DOMStringMap.

Examples

<div>
  <math>
    <msup id="equation" data-value="-1" data-equation="euler">
      <mi>e</mi>
      <mrow><mi>i</mi> <mi>π</mi></mrow>
    </msup>
    <mo>+</mo>
    <mn>1</mn>
    <mo>=</mo>
    <mn>0</mn>
  </math>
</div>

const el = document.querySelector("#equation");

console.log(el.dataset.value); // "-1"
console.log(el.dataset.equation); // "euler"

Result

Interactive exampleOpen the canonical MDN source to run this embedded demo.

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also