hreftunnus

Hreftunnus is the Finnish term for the href attribute used in Hypertext Markup Language (HTML). It specifies the destination URL of a hyperlink or the resource linked by other HTML elements. The attribute is most commonly associated with the anchor element, <a>, but is also supported by other elements such as <area>, <link>, and <base>.

The value of the hreftunnus is a URL. It can be absolute, such as https://example.org, or relative to the document’s location. It can also use special schemes such as mailto: or tel:, and in some contexts data: URLs or fragment identifiers beginning with # can point to a location within the same document. The href value must be properly encoded for any special characters, and spaces are typically represented as %20.

In practice, a typical usage looks like: <a href="https://example.org">Example</a>. The href determines where the browser will navigate when the link is activated, and search engines may follow the link to discover new pages. Accessibility considerations include ensuring that the link text clearly describes the destination for users of assistive technologies; empty or non-descriptive links should be avoided.

Security and best practices: when linking to external sites, consider using rel="noopener" and target="_blank" to mitigate security risks, and avoid constructing href values from untrusted input without proper encoding. The hreftunnus is a fundamental part of web navigation and a central element in creating interconnected web pages.