The only way I see DMCA applying here is contributory infringement in enabling modification of the page. With that in mind I think the question to be answered is does a user/viewer have the right to modify a page in their own web browser or must they view the page as intended by the creators? You can get in to technicalities then like are Links creators committing contributory infringement, but I'm not sure that's he…
I have yet to see a compelling/coherent argument for why they shouldn't.
As a partially sighted user myself, I find it infuriating when web developers try to override browser behaviour/modifications (e.g. blocking pinch to zoom). If we go down a path where users can't modify pages, we are taking a huge step backwards.