Today I wanted to quickly diagnose an issue on google.com on iOS: why two finger double tapping a link did not open a new window (with system default settings for link tapping). I was able to identify the cause being an event listener by disabling JavaScript, but this is sledgehammer as it can effect page layout. I propose that we expose some way to toggle enabling/disabling all event listeners on a page OR even better both on a page and some subset of the page's DOM.