injectLink
steal-css.CSSModule.prototype.injectLink
Injects a <link> tag for this module into the document.head.
css.injectLink()
Creates a new <link rel=stylesheet> element using the CSSModule's address as the link's href. Waits until the link has loaded (using the load event in modern browsers and other techniques elsewhere).
Returns
{Promise}
A promise that will resolve when the CSS, including all imports, have been loaded.