I found an input related bug in Unity 2019.3.14f where in the editor itself everything works fine, but when I create a WebGL build the mouse inputs are bugged. Making tiny movements to pan around an object in one direction yields no inputs, even when I can see my cursor moving. I have a click to drag system in place, but moving the mouse left or up in tiny increments (one pixel at a time) doesn't move the camera at all. Going the other direction works fine, no issue. It only picks up mouse movements when I make larger movements. Here's a video. I backported the project to Unity 2019.2.19f and the problem disappeared, so it must be localized to Unity 2019.3.14f.