CSSFontFeatureValuesMap: forEach() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The forEach() method of CSSFontFeatureValuesMap instances executes a provided function once per each key/value pair in this map, in insertion order.
Syntax
js
forEach(callbackFn)
forEach(callbackFn, thisArg)
Parameters
callbackFn-
A function to execute for each entry in the map. The function is called with the following arguments:
thisArgOptional-
A value to use as
thiswhen executingcallbackFn.
Return value
None (undefined).
Examples
Basic usage
The following example logs the key and value for each entry in the @swash rule. This example is using @swash but also works with other feature value blocks.
CSS
css
@font-feature-values "MonteCarlo" {
@swash {
swishy: 1;
swashy: 2;
}
}
JavaScript
js
// function to be used as callback
function logSwashes(value, key, map) {
console.log(`('${key}') = ${value}`);
}
// get the rules
const myRule = document.styleSheets[0].cssRules[0];
myRule.swash.forEach(logSwashes);
// logs:
// "('swishy') = 1"
// "('swashy') = 2"
Specifications
| Specification |
|---|
| CSS Fonts Module Level 4 # cssfontfeaturevaluesmap |