<p>Google was founded by Larry Page and Sergey Brin while they were <u> Ph.D.students </u> at <strong>Stanford University</strong>.</p>
what is wrong with my code??
Reset your code and try again. See if it helps. Sometimes the validator does not allow extra spaces in the code.
So if you mistakenly deleted a space or added a space somewhere else. It will recongize that it is wrong.