If you've ever needed to hunt through a massive HTML project for a specific, repetitive clause, there aren't a lot of tool that are really that helpful. I'm sure there are some tools better suited to it, but I found a recipe for gawk that I like.

About fifteen years ago at a startup, I built a very data-heavy single page app for biologists to manage a map/reduce version of a gene sequencing engine, and because it was data heavy, it made use of templates to render much of the HTML. If you've ever been in this situation, you reach for a library.

With HTML Templates, you might not need a library. But I suspect you're going to want one.