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HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.
The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output .
Do not use let scriptNameSettingName = 'value here'; in the common.js file. If the user forgets the setting, you may get undeclared variable errors. If you want your user script to write and save configuration settings as it is running, you may want to have it write to its own .js file in the user's userspace.
In my quick testing, it appears that the C0 control codes do not survive a round-trip through the MediaWiki parser, but other non-printing characters do, and these characters show up surprisingly commonly in wikitext (the biggest offenders I've noticed are left-to-right marks and right-to-left marks, though I've come across a variety of them).
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
JS script, designed for Timeless, which brings useful links directly accessible in the main page and remove useless links. N/A: N/A: mobileUndo : Adds an undo button to the mobile diff interface. 46: 15: RC Patroller : Adds a portlet to the sidebar that shows a regularly updated list of recent changes. 97: 6: Timeless New Message Highlight
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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.