@yury-s Could you please take a look?

Thanks for digging into this! Unfortunately this approach doesn't fix the underlying issue. The problem in #39246 isn't that the right-click's mousedown fails to propagate — the page already receives it. It's that on the non-Cocoa WebKit port the right click opens a native modal context menu that swallows the following left click (which never reaches the page at all). Re-dispatching the mousedown doesn't dismiss that menu, so the reported bug remains, and it also double-fires mousedown on every right click. The real fix needs to prevent/dismiss the native context menu under automation, which we'll handle at the browser-patch level. Closing this one — thanks again for the investigation.