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Html1527: Doctype Expected. The Shortest Valid Doctype Is ""

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Good day, I am working on a c# web application, everything is working until I add in a normal JavaScript. The html code is something as follow:

Solution 1:

IE issues a warning about <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">, because such a string is not a valid doctype according to HTML5. The warning as such has no impact on anything. It’s just part of HTML5 evangelism.

After you changed it to <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">, the issue was removed. But you probably saw the results of using some cached copy that has a wrong doctype. Testing with a fresh file (with a new name) should fix this issue.

Of course, the code as such does not validate, since the ASP tags are taken literally and interpreted as body content, but that’s a different issue.

The practical move is to use <!DOCTYPE html> as suggested. If you wish to still validate against the XHTML 1.0 specification for example, you can do this using the validator’s user interface to override the doctype.

But it’s not a big issue; you can just as well simply ignore the warning. If you have some functional errors, they are caused by something else and should be asked separately, with sufficient data provided.

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