tldr; go to the DEMO Framework or vanilla JS, the browser plays by its own rules. Understanding them can be the difference between a janky mess and a smooth experience. A Frame in 16.67 Milliseconds JavaScript runs on a single thread and must yield control to the browser to get anything drawn. Here is what happens during one frame: Scripting - The JavaScript engine runs your code. Style Calculation - The browser figures out which CSS rules apply and computes the final styles, resolving cascades,...