The load() method of the FontFaceSet forces all the fonts given in parameters to be loaded.

font

a font specification using the CSS value syntax, e.g. "italic bold 16px Roboto"

text

limit the font faces to those whose Unicode range contains at least one of the characters in text. This does not check for individual glyph coverage.

A Promise fulfilled with an Array of loaded FontFace objects. The promise is fulfilled when all the fonts are loaded; it is rejected if one of the fonts failed to load.

The following example returns a promise that will be fulfilled or rejected according the success of loading "MyFont". The code in then() can assume the availability of that font.

document.fonts.load("12px MyFont", "ß").then(/* ... */);