The Window interface's matchMedia() method returns a new MediaQueryList object that can then be used to determine if the document matches the media query string, as well as to monitor the document to detect when it matches (or stops matching) that media query.| MDN Web Docs
The @media CSS at-rule can be used to apply part of a style sheet based on the result of one or more media queries. With it, you specify a media query and a block of CSS to apply to the document if and only if the media query matches the device on which the content is being used.| MDN Web Docs
The HTML element specifies relationships between the current document and an external resource. This element is most commonly used to link to stylesheets, but is also used to establish site icons (both "favicon" style icons and icons for the home screen and apps on mobile devices) among other things.| MDN Web Docs
XMLHttpRequest (XHR) objects are used to interact with servers. You can retrieve data from a URL without having to do a full page refresh. This enables a Web page to update just part of a page without disrupting what the user is doing.| MDN Web Docs
The HTTP Accept request and response header indicates which content types, expressed as MIME types, the sender is able to understand. In requests, the server uses content negotiation to select one of the proposals and informs the client of the choice with the Content-Type response header. In responses, it provides information about which content types the server can understand in messages to the requested resource, so that the content type can be used in subsequent requests to the resource.| MDN Web Docs
serif | drafts.csswg.org
What is that preload? What does it do? And how can it help you? Preload gives developers the ability to define custom loading logic without suffering the performance penalty that script-based resource loaders incur. In human terms, it’s a way to tell a browser to start fetching a certain resource, because you as authors know that the browser is going to need that particular resource pretty soon.| Smashing Magazine
hyperlink.toString()hyperlink.hrefHTMLAnchorElement/href| html.spec.whatwg.org