CSSMathValue - Web APIs 编辑

Draft

This page is not complete.

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The CSSMathValue interface of the CSS Typed Object Model API a base class for classes representing complex numeric values.

Interfaces based on CSSMathValue

Below is a list of interfaces based on the CSSMathValue interface.

• CSSMathInvert
• CSSMathMax
• CSSMathMin
• CSSMathNegate
• CSSMathProduct
• CSSMathSum

Properties

CSSMathValue.operator

Indicates the operator that the current subtype represents.

Event handlers

No

Methods

None.

Examples

We create an element with a width determined using a calc() function, then console.log() the operator.

<div>has width</div>

We assign a width with a calculation

div {
  width: calc(30% - 20px);
}

We add the JavaScript

const styleMap = document.querySelector('div').computedStyleMap();

console.log( styleMap.get('width') );                  // CSSMathSum {values: CSSNumericArray, operator: "sum"}
console.log( styleMap.get('width').operator );         // 'sum'
console.log( styleMap.get('width').values[1].value );  // -20

The CSSMathValue.operator returns 'sum' because styleMap.get('width').values[1].value ); is -20: adding a negative number.

Specifications

Browser compatibility

BCD tables only load in the browser