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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. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
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A style applied to an HTML element via HTML "style" attribute 3: Media Type: A property definition applies to all media types unless a media-specific CSS is defined 4: User defined: Most browsers have the accessibility feature: a user-defined CSS 5: Selector specificity: A specific contextual selector (# heading p) overwrites generic definition ...
Search engines try to utilize canonical link definitions as an output filter for their search results. If multiple URLs contain the same content in the result set, the canonical link URL definitions will likely be incorporated to determine the original source of the content.
The international call prefix depends on the country you are calling from; e.g., 00 for most European countries, and 011 from North America. For domestic calls (within the country), 0 must be dialed before the area code.
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).
AMP (originally an acronym for Accelerated Mobile Pages [1]) is an open source HTML framework developed by the AMP Open Source Project. [2] It was originally created by Google as a competitor to Facebook Instant Articles and Apple News. [3]
Many websites are targeted at audience with different languages and localized for different countries. This can cause a lot of duplicate content or near duplicate content, as well as targeting issues with users from search engines.