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[2] [3] Leaving attribute values unquoted is considered unsafe. [4] Although most attributes are provided as paired names and values, some affect the element simply by their presence in the start tag of the element [5] (like the ismap attribute for the img element [6]). The abbreviation element, abbr, can be used to demonstrate these various ...
Initially code-named "Cougar", [18] HTML 4.0 adopted many browser-specific element types and attributes, but also sought to phase out Netscape's visual markup features by marking them as deprecated in favor of style sheets. HTML 4 is an SGML application conforming to ISO 8879 – SGML.
XHTML5 is simply XML-serialized HTML5 data (that is, HTML5 constrained to XHTML's strict requirements, e.g., not having any unclosed tags), sent with one of XML media types. HTML that has been written to conform to both the HTML and XHTML specifications and therefore produces the same DOM tree whether parsed as HTML or XML is known as polyglot ...
Some early versions of Netscape used the HTML link tag to construct a navigation bar to navigate websites. [5] Today, the nav tag can be used for the same purpose. [6] In HTML5, navigation elements are enclosed in a <nav> tag, often, containing a list of links.
In HTML 4.01, which was released in 1999, the attribute was made to be a requirement for the img and area tags. [2] It is optional for the input tag and the deprecated applet tag. [3] Internet Explorer 7 and earlier render text in alt attributes as tooltip text, which is not compliant with the World Wide Web Consortium (W3C)'s HTML standards. [4]
A separate document is linked to a frame using the src attribute inside the <iframe />, an inline HTML code is embedded to a frame using the srcdoc attribute inside the <iframe /> element. First introduced by Microsoft Internet Explorer in 1997, standardized in HTML 4.0 Transitional, allowed in HTML5.
W3Schools is a freemium educational website for learning coding online. [1] [2] Initially released in 1998, it derives its name from the World Wide Web but is not affiliated with the W3 Consortium. [3] [4] [unreliable source] W3Schools offers courses covering many aspects of web development. [5] W3Schools also publishes free HTML templates.
In cases where the content attribute's value is a URL, many authors decide to use a link element with a proper value for its rel attribute as well. [ 27 ] For a comparison on when it is best to use HTTP-headers, meta-elements, or attributes in the case of language specification: see here .