Preload stylesheets

[daun]

Describe the proposed solution

• Parse the head of preloaded pages for stylesheets and prefetch them
• Stylesheets are always render-blocking when in the head, so it makes sense to prefetch them
• Should use native rel=prefetch markup as swup has no concept of an asset cache

Alternatives considered

• Implement it myself in the page:preload hook

How important is this feature to you?

• [x] Nice to have
• [ ] Would make my life a lot easier
• [ ] I cannot use swup without it