You're reading a website, but the text feels cramped. Lines are too close together, making it hard to track from one line to the next. Words blur together. You try increasing your browser's font size, but that only makes part of the problem worse - now the text is bigger but still squished together.
If you could just add a little more space between lines, between words, between letters... you'd be able to read comfortably. But when you try using a browser extension to adjust spacing, the layout breaks. Text gets cut off. Paragraphs overlap. Buttons disappear.