Ever wanted to add simple HTML to your question titles, but couldn’t figure out how?
Good news—you can! 
How it works
When editing a question, you can insert very basic HTML directly into the title field (the same place where you type your question).
Example
If you enter:
<b>Math Questions</b>
…the title will appear bold when the question is displayed.
Important notes
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Not all HTML tags work — support is limited -
This feature is still being tested, so behavior may change
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If you discover which tags work (or don’t), post your findings here to help keep the thread active and useful
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It works for all questions, not just the new text blocks
Comparison
Editing version:
First two questions have html whereas the third question does not.
Form version:
First two questions have html whereas the third question does not.
Feel free to experiment and share what you learn!