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HTML attribute: Difference between revisions

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→Common attributes: rm poorly chosen/written link about multiple class names
→Common attributes: "semantic [...] or [...] presentation" (understood as XOR) is a false dichotomy; the traditional use of classes in CSS selectors is just hooking onto the annotations that the class list adds to the semantic model...
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* The '''<code>id</code>''' attribute provides a document-wide unique identifier for an element.<ref>However, multiple identifiers may apply to the same element; in particular an element may be inside another element, each having an identifier.</ref><ref>{{Cite web|url=https://www.w3schools.com/html/html_id.asp|title=HTML id|website=www.w3schools.com|access-date=2020-04-27}}</ref><ref>{{Cite web|url=https://www.w3schools.com/tags/att_global_id.asp|title=HTML Global id Attribute|website=www.w3schools.com|access-date=2020-04-27}}</ref> This can be used as [[CSS selector]] to provide presentational properties, by browsers to focus attention on the specific element, or by scripts to alter the contents or presentation of an element. Appended to the URL of the page, the URL directly targets the specific element within the document, typically a sub-section of the page. For example, the ID "Attributes" in <code><nowiki>http://en.wikipedia.org/wiki/HTML#Attributes</nowiki></code> (to refer to the section "Attributes" in the "HTML" page).
* The '''<code>class</code>''' attribute provides a way of classifying similar elements. Multiple class names can be added by separating them with spaces.<ref>{{Cite web|url=https://www.w3schools.com/html/html_classes.asp|title=HTML Classes|website=www.w3schools.com|access-date=2020-04-27}}</ref><ref>{{Cite web|url=https://www.w3schools.com/tags/att_global_class.asp|title=HTML Global class Attribute|website=www.w3schools.com|access-date=2020-04-27}}</ref> This can be used for [[semantics|semantic]] purposes, or for presentation purposes. Semantically, for example, classes are used in [[microformat]]s. Presentationally, Additionally authors of style sheets can construct [[CSS selector|selectors]] that match elements by class for styling purposes. For example, an HTML document might use the designation <code>class="notation"</code> to indicate that all elements with this class value are subordinate to the main text of the document. Such elements might be gathered together and presented as footnotes on a page insteadpage—instead of appearing in the place wheresuggested theyby occurtheir inposition within the HTML source. Another presentationThe usestyle wouldsheet beauthor asmight aalso [[CSSdefine selector]].a Multiplerule classwith namesthe can<code>.notation</code> beselector addedand bydefine separatingthe themproperty with<code>font-size: spacessmall;</code>.
* An author may use the '''<code>style</code>''' non-attributal codes presentational properties to a particular element. The '''<code>style</code>''' attribute can be used on any HTML element (it will validate on any HTML element; however, it is not necessarily useful). It is considered better practice to use an element's <code>id</code> or <code>class</code> attributes to select the element with a [[Style sheet (web development)|stylesheet]], though sometimes this can be too cumbersome for a simple and specific or ad hoc application of styled properties.
* The '''<code>title</code>''' attribute is used to attach subtextual explanation to an element. In most browsers this attribute is displayed as what is often referred to as a [[tooltip]].
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