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The W3C also has a CSS validator, but this is less of an issue when editing Wikipedia pages, as CSS is an option and CSS validation errors typically are due to problems with skins, not problems in individual pages.
One example goal of a policy is a stricter execution mode for JavaScript in order to prevent certain cross-site scripting attacks. In practice this means that a number of features are disabled by default: Inline JavaScript code [a] <script> blocks, [b] DOM event handlers as HTML attributes (e.g. onclick) The javascript: links; Inline CSS statements
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
Cross-origin resource sharing (CORS) is a mechanism to safely bypass the same-origin policy, that is, it allows a web page to access restricted resources from a server on a domain different than the domain that served the web page.
The same-origin policy applies only to scripts. This means that resources such as images, CSS, and dynamically loaded scripts can be accessed across origins via the corresponding HTML tags (with fonts being a notable exception). Attacks take advantage of the fact that the same origin policy does not apply to HTML tags.
Non-displayed links do not work (as opposed to links in a very small font). It cannot be used to remove text in expressions for template names, parameter names, parameter values, page names in links, etc. To view hidden text, download the Web Developer Toolbar for Firefox here, then choose Misc. → show hidden elements in that toolbar. It will ...
Previously, JavaScript only supported function scoping using the keyword var, but ECMAScript 2015 added the keywords let and const, allowing JavaScript to support both block scoping and function scoping. JavaScript supports automatic semicolon insertion, meaning that semicolons that normally terminate a statement in C may be omitted in ...
Downloading files from FTP, HTTP(S) and BitTorrent sources. Pausing and resuming of downloading files, as well as the ability to restart a download. Gives of information about current and pending downloads. Embedding into system tray of the host system. Integration with the KDE Konqueror and Rekonq web browsers.