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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.
Incorrect HTML entity escaping may also open up security vulnerabilities for injection attacks such as cross-site scripting. If HTML attributes are left unquoted, certain characters, most importantly whitespace, such as space and tab, must be escaped using entities. Other languages related to HTML have their own methods of escaping characters.
In HTML syntax, an attribute is added to a HTML start tag. Several basic attributes types have been recognized, including: (1) required attributes needed by a particular element type for that element type to function correctly; (2) optional attributes used to modify the default functionality of an element type; (3) standard attributes supported ...
The language for an element should be specified with a lang attribute rather than the XHTML xml:lang attribute. XHTML uses XML's built-in language-defining functionality attribute. Remove the XML namespace (xmlns=URI). HTML has no facilities for namespaces. Change the document type declaration from XHTML 1.0 to HTML 4.01.
Examples of this include nesting a "ul" element directly inside another "ul" element for any of the HTML 4.01 or XHTML DTDs. Dan Connolly cites the use of title element outside the head section. [1] Use of proprietary or undefined elements and attributes instead of those defined in W3C recommendations.
Note: When there is an ISO 639 language tag for the non-English text's language, use that tag; do not use |lang-name=. When ISO 639 does not have a language that applies to the non-English text use |lang-name= for the non-English language name. This template applies proper html markup to the non-English text only when given a proper language tag.
Dynamic HTML, or DHTML, is a term which was used by some browser vendors to describe the combination of HTML, style sheets and client-side scripts (JavaScript, VBScript, or any other supported scripts) that enabled the creation of interactive and animated documents.
[4] [5] Typically, in multilingual websites, the TLD (https://www.example.com) will get the x-default value in each URL set and the language folders/subdomains will be assigned hreflang values. The URL that is defined as the x-default for a certain document, can also be specified for a certain language or language and region at the same time.