I wrote this sentence
Suppose that a user wants to eliminate the navigation links from the page sidebar. She may employ the link density feature in a rule to distinguish this part. (BUT ?) When this rule is applied to the page, all such elements will be (are?) removed, regardless of their location in the page, even if they are inside the main content.
I feel if I use but I can make a contrast between two succeeding sentences. as something surprising happened. Is it natural?