E001

We recommend using the simplified HTML5 <!DOCTYPE html> declaration on your Bootstrapped webpages. See also: Bootstrap's basic HTML template

Document is missing a DOCTYPE declaration

The (X)HTML document seems to not have any DOCTYPE declaration; this can trigger quirks mode, which is not supported by Bootstrap and can cause the document to render strangely.

Document declares a non-HTML5 DOCTYPE

The (X)HTML document has a DOCTYPE declaration, but it's not an HTML5 DOCTYPE. This can potentially cause problems, especially if you're trying to use HTML5 features. Bootstrap's documentation assumes that you're using HTML5.

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