MathMLElement: dataset property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2023.
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
html
<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>
js
const el = document.querySelector("#equation");
console.log(el.dataset.value); // "-1"
console.log(el.dataset.equation); // "euler"
Result
Specifications
| Specification |
|---|
| HTML # dom-dataset-dev |
Browser compatibility
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