How many HTML heading levels are there?
The answer is 6. The HTML heading elements are h1, h2, h3, h4, h5, and h6. You can use these elements to create a hierarchical outline of the contents of an HTML document.
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All answers ▸What's wrong with the following HTML markup: <p style"font-size:10px;">Copyright <span>2015</span></p>?
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Show how you would give all elements that have a class of 'class1', a green background.