- From: Jacob Rossi via GitHub <sysbot+gh@w3.org>
- Date: Fri, 01 Jul 2016 20:43:35 +0000
- To: public-css-archive@w3.org
@bradkemper here's the issue, as I understand it: When the parser loads the document, it may hit responsive images (srcset/<picture>). At that point, the parser wants to be able to kick off network requests for the right resource. However, if there's an at-viewport rule in an external stylesheet (which, by definition, is async loaded) then you don't actually know what the final viewport settings will be. As such, the parser/preloader doesn't know which resource to go fetch. So either (a) you guess and may end up loading the wrong one (make 2 img request, waste data, and possibly flash of the wrong content), or (b) block and wait until you've loaded the external stylesheets (non-starter, PLT would get killed). <meta> doesn't have this issue since it's inline in the HTML. Additionally, an inline style with at-viewport doesn't have the issue since it can be parsed synchronously. -- GitHub Notification of comment by jacobrossi Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/258#issuecomment-230043273 using your GitHub account
Received on Friday, 1 July 2016 20:43:51 UTC