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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).
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
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The W3C is the main international standards organization for the internet— they provide the W3C Markup Validation Service.Simply copy the full URL of the page to be validated and paste in into the validator.
Verification is intended to check that a product, service, or system meets a set of design specifications. [6] [7] In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service, or system, then performing a review or analysis of the modeling results.
XHTML 1.0 was "a reformulation of the three HTML 4 document types as applications of XML 1.0". [7] The World Wide Web Consortium (W3C) also simultaneously maintained the HTML 4.01 Recommendation.
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Both JSLint and JSHint were lacking the ability to create additional rules for code quality and coding style. [3] After contributing to JSHint, Zakas decided to create a new linting tool in June 2013, ESLint (originally called JSCheck, but renamed a month later), where all rules are configurable, and additional rules can be defined or loaded at run-time.