> Major commercial sites are built with little to no direct DOM manipulation. Little implies some, and I think the average bundle is already large enough witho

> Major commercial sites are built with little to no direct DOM manipulation. Little implies some, and I think the average bundle is already large enough without saying, "Oh, just throw jQuery in there whenever you do need to do DOM manipulations.", which will happen. I built a React app a couple weeks ago where I had to use portals to integrate it with a legacy form solution because we didn't have time to rewrite the entire form backend to justify a custom frontend. It involved a fair amount of manual DOM manipulation, but it worked out fine. All said and done, it was probably ~75 lines in a file with a few more comments than usual. It doesn't make sense to add 30kb or even 10kb to the bundle for that, so yes, I would expect the average developer to know the base DOM api at least somewhat well. edit: I completely forgot about TDD. Depending on your testing environment, you may need to understand the DOM api for mocking or base utilities built into the test suite.