Modernizr: Rel Prefetch Support?

[jhned]

Any chance we could get a detect for rel prefetch? It'd be super-helpful for WebKit browsers. There's a bug out for it now, but no movement yet.

[roblarsen]

I wonder if there's any easy way to test that feature. 🤔

[rejas]

Maybe there is some similar test in Modenrizr already that can be used as a blueprint?

[roblarsen]

I'm going to look at it a little bit since I've got a bit more time on my hands and this strikes me as a funny problem to solve (also: potentially impossible?)

[patrickkettner]

https://github.com/Modernizr/Modernizr/issues/2297

[roblarsen]

I wouldn't have thought of that, which is funny, because I replied to that other issue. I don't know that I looked after posting the pointer, though. Thanks Patrick

[jhned]

Yeah, looks like this might work.

[rejas]

So, feeling ready to do a PR? :-)

[HeroProtagonist]

👋 I would like to take a crack at this one.

[rejas]

Go for it!

[HeroProtagonist]

PR submitted!
If desired, I could also add detection for rel=preload in the same directory in another PR

[HeroProtagonist]

Is it ok to do browser detection for the IE11 edge case pointed out on the PR?
https://github.com/Modernizr/Modernizr/pull/2610#issuecomment-709717161

[rejas]

At least a note / warning should be added to the docs of the feature detect. Not sure if detecting IE11 specifically should be done....