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Extensions 
Chrome
Web store Download HTML Validation Bookmarklet chrome extension. HTML markup validation bookmarklet using the W3C API and install in your Google chrome browser. This is Direct HTML Validation Bookmarklet Crx download for Chrome it is also called HTML Validation Bookmarklet offline CRX for chrome Download. This HTML Validation Bookmarklet is used to HTML markup validation bookmarklet using the W3C API
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The plugin for live HTML validation of a browser page during web development.
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A HTML5 validation library, using a JavaScript port of the excellent TIDY library
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Hint execution of your bookmarklets
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HTML Visual Validation gives you information about the html elements, live, on page.
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An IDE used for creating / managing bookmarklets
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Add HTML Validator in Developer Tools
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Simple button to press when you want HTML5 Form validation to be removed from all the forms.
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FraudGrade provides IP Validation, Email Validation, Phone Validation and Domain Validation to 1000's of businesses daily!
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Shows SEO issues as you navigate pages. Displays performance data and full AMP status and errors for HTML pages.
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MEK