Allow use of display option for google font api

[adamcupial]

google font api started supporting display param as of may 2019 (announced at google io).

I have prepared a change to allow the use of this functionality through webfontloader, changes added also to README and tests.

[terrymun]

Can't wait to see this being merged in: right now there is no other way to force font-display: swap unless we compose our own custom module/provider 😭

[bdrtsky]

Agree. We need font-display option.

[simonjoom]

Thanks! i won 2 points performance in my lighthouse Audit performance with that! That should to be merged. or even no need to add font-display in option, it should to be added for any fonturl. (i think) In the minify code of webfontloaded: i just added it: that's it
(b += "&text=" + encodeURIComponent(a.g)+"&display=swap");

[quicoto]

What's the status of the PR?

[HofmannZ]

It's 2020 we need this!

[adamcupial]

This repo doesn't look very maintained anymore, if someone needs this functionality just use my fork.

[LucidNeko]

For what it's worth, &display=swap appears to work if it's specified on the last familiy.

WebFont.load({
  google: {
    families: [
      "Material+Icons",
      "Roboto:300,400,500,700&display=swap",
    ]
  }
}