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Breadcrumbs typically appear horizontally across the top of a Web page, often below title bars or headers. They provide links back to each previous page the user navigated through to get to the current page or—in hierarchical site structures—the parent pages of the current one.
When visiting a web page, the referrer or referring page is the URL of the previous web page from which a link was followed. More generally, a referrer is the URL of a previous item which led to this request. For example, the referrer for an image is generally the HTML page on which it is to be displayed.
According to Google, the canonical link element is not considered to be a directive, but rather a hint that the ranking algorithm will "honor strongly". [1] [9] While the canonical link element has its benefits, Matt Cutts, then the head of Google's webspam team, has said that the search engine prefers the use of 301 redirects.
A link relation is a descriptive attribute attached to a hyperlink in order to define the type of the link, or the relationship between the source and destination resources.
An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). [ vague ] The first used version of HTML was written by Tim Berners-Lee in 1993 and there have since been many versions of HTML.
Absolute URLs are URLs that start with a scheme [5] (e.g., http:, https:, telnet:, mailto:) [6] and conform to scheme-specific syntax and semantics. For example, the HTTP scheme-specific syntax and semantics for HTTP URLs requires a "host" (web server address) and "absolute path", with optional components of "port" and "query".
When the primary resource is an HTML document, the fragment is often an id attribute of a specific element, and web browsers will scroll this element into view. A web browser will usually dereference a URL by performing an HTTP request to the specified host, by default on port number 80.
XPath (XML Path Language) is an expression language designed to support the query or transformation of XML documents. It was defined by the World Wide Web Consortium (W3C) in 1999, [ 1 ] and can be used to compute values (e.g., strings , numbers, or Boolean values ) from the content of an XML document.