I have this sentence:
By inserting HTML tags into a page of text and other content, you mark which part of the page is what to provide structure to the document.
By inserting HTML tags into a page of text and other content is the adverb of manner ,in the last part of the sentence, you mark which part of the page is what to provide structure to the document.
My questions are:
- Is you mark which part of the page the subject?
- How to understand the what in what to provide structure to the document?