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Omnivalidator sends the content of the currently visible page to one or more validation services configured in the extension preferences. These validators may be publicly hosted (the defaults are the publicly hosted W3C Markup Validator and Validator.nu) or hosted locally. The results are retrieved from the validators, parsed, and displayed in a collapsable error display panel and summarized with an icon and tooltip on the Omnivalidator button, which can be placed on a browser toolbar. Validation is initiated either by clicking on the Omnivalidator button or by configuring URLs which are automatically validated with one or more validators in the extension preferences.

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