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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 ...
The first alpha version of Bootstrap 4 was released on August 19, 2015. [16] The first beta version was released on August 10, 2017. [17] Otto suspended work on Bootstrap 3 on September 6, 2016, to free up time to work on Bootstrap 4. Bootstrap 4 was finalized on January 18, 2018. [18] Significant changes include: Major rewrite of the code
The title attribute is used to attach a subtextual explanation to an element. In most browsers this attribute is displayed as a tooltip. The lang attribute identifies the natural language of the element's contents, which may be different from that of the rest of the document. For example, in an English-language document:
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]
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 ...
However, it varied depending on the element. The HTML width attribute of a table defined the width of the table including its border. [7] On the other hand, the HTML width attribute of an image defined the width of the image itself (inside any border). [8] The only element to support padding in those early days was the table cell.
JavaScript code can use the Document Object Model (DOM), provided by the HTML standard, to manipulate a web page in response to events, like user input. Using a technique called AJAX , JavaScript code can also actively retrieve content from the web (independent of the original HTML page retrieval), and also react to server-side events as well ...
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 .