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function loadAllFonts() {
// Use this to wait for all fonts in a testcase to load rather than just using
// `document.fonts.ready.then(...)` in the load event, since there are compat
// issues between browsers as to whether content initiated font loads are
// guaranteed to have been started by this point.
// FIXME: Use Promise.all() to cause an obvious failure when a font fails to load.
return Promise.allSettled([...document.fonts].map(f => f.load()));
}