Validation, HTML, Text Editor, Options Dialog Box
These settings allow you to set preferences for how the HTML editor checks for correct syntax in your document.
To access this dialog box
In Microsoft Visual Web Developer, click Tools, and then click Options.
The Options dialog box opens.
In the left panel, expand the Text Editor node, expand the HTML node, and click Validation.
If you have configured your environment settings for Web development, the Validation node is at the top level. For more information about environment settings, see How to: Change Select Settings.
Additional HTML options can be found under the HTML Designer node, which is visible if the Show all settings check box is selected.
For more information about validation settings, see Markup Validation in Visual Web Developer.