The delete() method of the FontFaceSet interface removes a font from the set.

Font faces that were added to the set using the CSS @font-face rule remain connected to the corresponding CSS, and cannot be deleted.

font

A FontFace to be removed from the set.

A boolean value which is true if the deletion was successful, and false otherwise.

In the following example a new FontFace object is created and then deleted from the FontFaceSet.

const font = new FontFace("MyFont", "url(myFont.woff2)");
document.fonts.delete(font);