W3C Markup Validation Service

Related

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  Polypane helper

  Open the current page or links in Polypane, the developer tool for responsive web development and design.

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  Web Developer

  Adds a toolbar button with various web developer tools. The official port of the Web Developer extension for Firefox.

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  AMP Validator

  Automatically checks each page for AMP validation.

  คะแนน: จำนวนคะแนนรวมทั้งหมด: 6

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  CORS Toggle

  Adds Access-Control-Allow-Origin, Access-Control-Allow-Methods and Access-Control-Allow-Headers headers for CORS.

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  Webmaster menu

  Adds new items to browser context menu that open various analyzes of browsed web pages and sites.

  คะแนน: จำนวนคะแนนรวมทั้งหมด: 4