I'll gladly admit that creating boilerplate from memory is a low-value skill, but you absolutely must know why it is there, and what does it do.

Through the eyes of the interviewer, you googling those tags means you don't know what they do. If you were hired and for some reason had to change those tags, what is the chance that you'll just google and copy/paste? (again, through the eyes of the interviewer)

To be fair, not all people work the same way. Some are happy to swim through the mountain of knowledge that web development has become these days, others are happier specializing in a subset of web development, and others will prefer to diversify their knowledge outside of web development, which means wider breadth in exchange for lesser depth. The interviewed should make sure to clearly transmit how he works, so the interviewer doesn't have to make too many assumptions.