The following question was flagged as spam and promptly deleted:
https://askubuntu.com/questions/626807 (only visible to 10k users)
The title displayed on the page states that:
"This question was marked as spam or offensive and is therefore not shown"
That's all fine and well, but the question title is still shown in the browser's titlebar:
Now, the title of this question is hardly offensive - but suppose that it were. I assume that the message displayed on the page in place of the title exists to keep users from seeing words/phrases that they'd rather not see.
Therefore it only makes sense that the contents of the
<title> tag should similarly be replaced with the message.