swap-high strategy probably requires the as attribute

[AioiLight]

beasties/packages/beasties/src/index.ts

Lines 304 to 310 in 97a3512

	else if (preloadMode === 'swap-high') {
	// @see http://filamentgroup.github.io/loadCSS/test/new-high.html
	link.setAttribute('rel', 'alternate stylesheet preload')
	link.setAttribute('title', 'styles')
	link.setAttribute('onload', `this.title='';this.rel='stylesheet'`)
	noscriptFallback = true
	}

https://html.spec.whatwg.org/multipage/semantics.html#attr-link-as

Currently, using swap-high will output a link tag without an as attribute. This may result in invalid preloading.

In Firefox, it will explicitly log to the console that preloading is disabled.

IMO preloading does not require alternate stylesheet values and title attributes, rel="preload" and as="style" seem sufficient.