If a cross-origin iframe has moved recently within its embedding page, then we will silently discard events targeting the iframe. The rationale is that if the iframe moved recently, it is likely that the user did not intent to click or tap on it. For more information about the risks of mis-clicks: https://www.w3.org/Security/wiki/Clickjacking_Threats#Repositioning_the_trusted_window This intervention shipped in limited form in 2019: it only affected iframes containing script using V2 features of IntersectionObserver (i.e. occlusion/effect detection). This launch expands this behavior to all cross-origin iframes, regardless of whether they are using IntersectionObserver V2.