The crossorigin attribute, valid on the , , ,| MDN Web Docs
The preload value of the element's rel attribute lets you declare fetch requests in the HTML's| MDN Web Docs
The HTTP Access-Control-Allow-Origin response header indicates whether the response can be shared with requesting code from the given origin.| MDN Web Docs
The HTTP Referer request header contains the absolute or partial address from which a resource has been requested. The Referer header allows a server to identify referring pages that people are visiting from or where requested resources are being used. This data can be used for analytics, logging, optimized caching, and more.| MDN Web Docs
The HTML element (or anchor element), with its href attribute, creates a hyperlink to web pages, files, email addresses, locations in the same page, or anything else a URL can address.| MDN Web Docs
Use the HTML element with either the canvas scripting API or the WebGL API to draw graphics and animations.| MDN Web Docs
The HTTP Origin request header indicates the origin (scheme, hostname, and port) that caused the request. For example, if a user agent needs to request resources included in a page, or fetched by scripts that it executes, then the origin of the page may be included in the request.| 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
This document describes the structure, content, construction, and semantics of language tags for use in cases where it is desirable to indicate the language used in an information object. It also describes how to register values for use in language tags and the creation of user-defined extensions for private interchange. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.| IETF Datatracker