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  2. Help:Markup validation - Wikipedia

    en.wikipedia.org/wiki/Help:Markup_validation

    This section gives examples of diagnostics generated by the markup validation service, and suggests possible fixes. Diagnostics are by line and column of the generated HTML for the page. It may be helpful to obtain the HTML in order to understand the diagnostic. For example, if you using the Firefox browser, you can type control-U to see the HTML.

  3. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

  4. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The request contained valid data and was understood by the server, but the server is refusing action. This may be due to the user not having the necessary permissions for a resource or needing an account of some sort, or attempting a prohibited action (e.g. creating a duplicate record where only one is allowed).

  5. HTML element - Wikipedia

    en.wikipedia.org/wiki/HTML_element

    Subsequently, HTML 4.01 was rewritten in an XML-compatible form, XHTML 1.0 (eXtensible HTML). The elements in each are identical, and in most cases valid XHTML 1.0 documents will be valid or nearly valid HTML 4.01 documents. This article mainly focuses on real HTML, unless noted otherwise; however, it remains applicable to XHTML.

  6. Category:CS1 errors: dates - Wikipedia

    en.wikipedia.org/wiki/Category:CS1_errors:_dates

    The access date (in |access-date=) is checked to ensure that it contains a full date (day, month, and year) and is between 15 January 2001 (the founding date of Wikipedia) and today's date plus one day, because it represents the date that an editor viewed a web-based source to verify a statement on Wikipedia. Because editors may be in time ...

  7. HTTP ETag - Wikipedia

    en.wikipedia.org/wiki/HTTP_ETag

    With this probability, if the response returns an altered content but the same ETag as what was previously cached, mark the website as buggy and disable ETag caching for it. As a reminder, for a strong ETag, the content comparison can be byte-for-byte, whereas, for a weak ETag, it would check semantic equivalence only.

  8. Template:Check date - Wikipedia

    en.wikipedia.org/wiki/Template:Check_date

    This template is used to check whether the given parameter is a month. It is useful for templates such as {{ Multiple issues }} that sort articles into cleanup categories by month. If the parameter is a month/date/time formatted in the way recognized by PHP's strtotime() , this template returns the month in the format Month Year , where Month ...

  9. Wikipedia : WikiProject Check Wikipedia/List of errors

    en.wikipedia.org/.../List_of_errors

    HTML text style element <i> (italics) Accessibility Source readability Found a <i> tag. Should use wiki markup of ''. See WP:Deviations: Low: No HTML text style element <p> Source readability Found a <p> tag. Usually should use wiki markup's blank line. Some tags, such as <ref> must use <p> due to a wikimedia bug.