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a submit button to send current form values to the server; These basic elements provide the most common graphical user interface (GUI) elements, but not all. For example, there are no equivalents to a tree view or grid view. A grid view, however, can be mimicked by using a standard HTML table with each cell
Basic support for the file-select control was adopted quickly by browser vendors. For example, already Internet Explorer 4, [7] Netscape Navigator 2.0 and Opera 3.5 [8] recognized the input element of type="file" as a file-select control. However, most modern browsers still do not implement the file-select control as it was intended, or lack ...
In HTML, the value can be left unquoted if it does not include spaces (attribute=value), or it can be quoted with single or double quotes (attribute='value' or attribute="value"). In XML, those quotes are required. Boolean attributes, on the other hand, do not require a value to be specified. An example is the checked for checkboxes:
Many field values may contain a quality (q) key-value pair separated by equals sign, specifying a weight to use in content negotiation. [9] For example, a browser may indicate that it accepts information in German or English, with German as preferred by setting the q value for de higher than that of en, as follows: Accept-Language: de; q=1.0 ...
HTML5 is intended to subsume not only HTML 4 but also XHTML1 and even the DOM Level 2 HTML itself. [ 7 ] HTML5 includes detailed processing models to encourage more interoperable implementations; it extends, improves, and rationalizes the markup available for documents and introduces markup and application programming interfaces (APIs) for ...
In SQL, wildcard characters can be used in LIKE expressions; the percent sign % matches zero or more characters, and underscore _ a single character. Transact-SQL also supports square brackets ([and ]) to list sets and ranges of characters to match, a leading caret ^ negates the set and matches only a character not within the list.
HTML markup consists of several key components, including those called tags (and their attributes), character-based data types, character references and entity references. HTML tags most commonly come in pairs like < h1 > and </ h1 >, although some represent empty elements and so are unpaired, for example < img >.
The idea is related to a placeholder (a symbol that will later be replaced by some value), or a wildcard character that stands for an unspecified symbol. In computer programming, the term free variable refers to variables used in a function that are neither local variables nor parameters of that function.