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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet/forEach below:

FontFaceSet: forEach() method - Web APIs

FontFaceSet: forEach() method

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The forEach() method of the FontFaceSet interface executes a provided function for each value in the FontFaceSet object.

Syntax
forEach(callbackFn)
forEach(callbackFn, thisArg)
Parameters
callbackFn

Function to execute for each element, taking three arguments:

value, key

The current element being processed in the FontFaceSet. As there are no keys in a FontFaceSet, the value is passed for both arguments.

set

The FontFaceSet which forEach() was called on.

thisArg

Value to use as this when executing callbackFn.

Return value

Undefined.

Specifications Browser compatibility

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