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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
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.
This was possible due to a bug in the Performance API that allowed the amount of time shown to the user to be negative when a redirect occurred. Google Chrome subsequently fixed this bug. [ 44 ] In 2023, Snyder et al. showed timing attacks could be used to perform pool-party attacks in which websites could block shared resources by exhausting ...
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 ...
XMLHttpRequest data is subject to this security policy, but sometimes web developers want to intentionally circumvent its restrictions. This is sometimes due to the legitimate use of subdomains as, for example, making an XMLHttpRequest from a page created by foo.example.com for information from bar.example.com will normally fail.
HTTrack uses a Web crawler to download a website. Some parts of the website may not be downloaded by default due to the robots exclusion protocol unless disabled during the program. HTTrack can follow links that are generated with basic JavaScript and inside Applets or Flash , but not complex links (generated using functions or expressions ) or ...
Global attributes apply to all tags. Attributes not listed here are not allowed by MediaWiki [1]: class: one or more classifications to which the element belongs. See Wikipedia:Catalogue of CSS classes. dir: text direction— "ltr" (left-to-right), "rtl" (right-to-left) or "auto". id: unique identifier for the element.
Cascading Style Sheets (CSS) are also applied differently. Due to XHTML's case-sensitivity, all CSS selectors become case-sensitive for XHTML documents. [26] Some CSS properties, such as backgrounds, set on the < body > element in HTML are 'inherited upwards' into the < html > element; this appears [clarification needed] not to be the case for ...