index.test

// Preload Processing steps
// - https://w3c.github.io/preload/#x3-1-processing
// - Blink Preload Tests
// - Mozilla Preload Issue https://bugzilla.mozilla.org/show_bug.cgi?id=1222633
/*

The appropriate times to obtain the resource are:

  - When the user agent that supports [RFC5988] creates a Document
    and processes Link headers that contain a preload link.

  - When the preload link's link element is inserted into a document.

  - When the preload link is created on a link element that is already in a document tree.

  - When the href attribute of the link element of a preload link that is
    already in a document tree is changed.

  - When the crossorigin attribute of the link element of a preload link that is
    already in a document tree is set, changed, or removed.

  - When the as attribute of the link element of a preload link that is already in a
    document tree is set or changed to a value that does not or no longer matches
    the request destination of the previous obtained external resource, if any.

  - When the as attribute of the link element of a preload link that is already in a document
    tree but was previously not obtained due to the as attribute specifying an
    unsupported request destination is set, removed, or changed.

  - When the type attribute of the link element of a preload link that is already in a document tree
    but was previously not obtained due to the type attribute not specifying a parsable MIME type
    or specifying an unsupported MIME type for the request destination is set, removed, or changed.

  - When the media attribute of the link element of a preload link that is
    already in a document tree but was not previously obtained due the media
    attribute's value being not a valid media query list or one that does not
    match the environment is set, removed, or changed.

*/

// https://trac.webkit.org/browser/webkit/trunk/LayoutTests/http/tests/preload
const
  slow_stylesheet = '"http://tools.w3clubs.com/pagr/1.sleep-1.css'

// https://developer.mozilla.org/en-US/docs/Web/API/HTMLLinkElement

// // disabled (stylesheets)
// href - for dynamic loading
// media - INTERESTING
// as - used for preload
// crossOrigin (experimental)
// referrerPolicy (experimental)
// rel - alternative/import/styelsheet/prefetch/preload/prerender
//
// prefetch attribute
// ? integrity - https://w3c.github.io/webappsec-subresource-integrity/
// ? load (Edge Chrome M)
// relList - RO = rel as list of tokens
// sheet - Stylesheet object
// type - mimetype of resource
//
// events
// (on)load
// The load event fires once the stylesheet and all of its imported content has been loaded and parsed, and immediately before the styles start being applied to the content.