What happens if you open the external CSS file in a browser?
When you try to open the external CSS file in a browser, the browser cannot open the file, because the file has a different extension. The only way to use an external CSS file is to reference it using a tag within another HTML document.
Pick out which is not a HTML tag?
What is the previous version of HTML, prior to HTML5?
Which doctype is correct for HTML5?
Which HTML5 element is used to specify a footer for a document or section?
Which element is no longer supported in HTML5?