- From: Brandon Benvie <bbenvie@mozilla.com>
- Date: Wed, 19 Jun 2013 13:22:31 -0700
- To: whatwg@lists.whatwg.org
On 6/19/2013 12:46 PM, Boris Zbarsky wrote: > On 6/19/13 3:43 PM, Kenneth Russell wrote: >> Accurate feature detection in libraries like Modernizr was mentioned >> as a key use case: >> >> http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2012-September/037249.html > > Right, this is the use case that's not really making sense to me. The > fact that Modernizr was doing this _eagerly_ sounds like a bug in > Modernizr to me... The point of using Modernizr or something like it is to detect availability of features on page load, and then conditionally load polyfills/alternate fallback implementations. It specifically does need to do eager detection to be useful. It can't wait until the first usage to do feature detection; it needs to be done up front when preparing dependencies for the main application. This is also why Modernizr provides a custom build tool. It allows for users to only do the feature detection on features they know they need to care about, because each check has some cost that needs to be paid early on in a page load.
Received on Wednesday, 19 June 2013 20:22:58 UTC