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Jul 29, 2010 · I can think of a few possible reasons: It may be a marketing tool. "Look, we code to appropriate standards!" This could apply to the individual who designed the site (and might include it …

W3C's easy-to-use markup validation service, based on SGML and XML parsers.

HTML comments are not displayed in the browser, but they can help document your HTML source code. You can add comments to your HTML source by using the following syntax: <!-- Write your …

Jan 24, 2015 · This error message is coming from a feature that was added to Drupal 8 to protect against HTTP Host header attacks. The feature is also described in the change record that was …

WikkaWiki is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages. Forked from WakkaWiki. Designed for speed, extensibility, and security. …

May 6, 2020 · Lines that begin with the hash character "#" are considered comments, and are ignored. Comments may not be included on the same line as a configuration directive. White space occurring …