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Options, Text Editor, HTML (Web Forms), Validation

Applies to: yesVisual Studio noVisual Studio for Mac

Note

This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

Use the Validation options page to set preferences for how the HTML editor checks the syntax of HTML markup in your document. To access this page, on the menu bar, choose Tools > Options, and then expand Text Editor > HTML (Web Forms) > Validation.

Validation

  • Use doctype for validation schema detection

    A schema determines which elements, attributes, and capitalization are valid in that schema. It also determines the tags and attributes that are available in IntelliSense.

    Select this option if you want Visual Studio to use the content of the page's <!DOCTYPE> declaration and html element to determine the schema. For example, if you select this option and the page has the declaration <!DOCTYPE html>, Visual Studio uses the HTML5 schema. However, if the html tag has an xmlns attribute, such as <html xmlns="http://www.w3.org/1999/xhtml">, Visual Studio uses the XHTML5 schema.

  • Target when no doctype found

    Choose the schema to validate against when there's no <!DOCTYPE> declaration in the page.

    • Show errors

      Select the check box to enable validation. If the check box isn't selected, the editor doesn't mark validation errors.

      The other check boxes let you fine-tune validation by specifying individual types of errors that you want the editor to mark.

      Note

      Some schemas do not offer options to mark individual types of errors. For example, if you choose XHTML 1.1 as the target schema, all option check boxes are disabled. In this instance, all types of errors are marked.

See also