MathMLElement: dataset property

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>
      <mi>iπ</mi>
    </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

Specifications

Browser compatibility

See also

• HTMLElement.dataset
• data-*
• Using data attributes