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No not rule but common sense. The h3 is called a headline tag for a reason. Because it is expected to be used in headlines.

For example, you could use the headline tag on the first line and leave the rest normal.

Edited. I still like the old stile ... :)

Returned a bit more than what you lost due to the downvote. ;-)

Thank you!

OK I see, and why you did not start with that before flaging ?