MathMLElement: attributeStyleMap property

The attributeStyleMap read-only property of the MathMLElement interface returns a live StylePropertyMap object that contains a list of style properties of the element that are defined in the element's inline style attribute, or assigned using the style property of the MathMLElement interface via script.

Shorthand properties are expanded. If you set border-top: 1px solid black, the longhand properties (border-top-color, border-top-style, and border-top-width) are set instead.

The main difference between style property and attributeStyleMap property is that, the style property will return a CSSStyleDeclaration object, while the attributeStyleMap property will return a StylePropertyMap object.

Though the property itself is not writable, you could read and write inline styles through the StylePropertyMap object that it returns, just like through the CSSStyleDeclaration object that returns via the style property.

Value

A live StylePropertyMap object.

Examples

The following code snippet shows the relationship between the style attribute and the attributeStyleMap property:

html
<div style="white-space: pre-line;">
  <math>
    <mrow>
      <mi>f</mi>
      <mo stretchy="false">(</mo>
      <mi id="el" style="border-top: 1px solid blue; color: red;">x</mi>
      <mo stretchy="false">)</mo>
      <mo>=</mo>
      <mi>x</mi>
    </mrow>
  </math>
  <div id="output"></div>
</div>
css
#el {
  font-size: 16px;
}
js
const element = document.getElementById("el");
const output = document.getElementById("output");

for (const property of element.attributeStyleMap) {
  output.textContent += `${property[0]} = ${property[1][0].toString()}\n`;
}

Specifications

Specification
CSS Typed OM Level 1
# dom-elementcssinlinestyle-attributestylemap

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
attributeStyleMap

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
See implementation notes.

See also