I saw this format in a book and was wondering how to create the varying thickness horizontal rules above the section headers. I am assuming an MWE isn't necessary here. I got some idea here but I think there's probably something more simple than TikZ for this.
[Tex/LaTex] Varying thickness hrule
linerulessectioning
Best Answer
That doesn't look like a varying width rule, just two rules:
For example using the section format mentioned in comments: