macOS Safari won't follow hyperlinks if they appear low on the page; scrolled up just fine

Lately, Safari fails to follow links if they're near the bottom of the window. Cursor change and hover highlight work as usual but a click doesn't follow the link. If I scroll the page up so the link is mid-window, then the link works. Sometimes I have to shrink the window to get the page to scroll. Sometimes dramatically resizing the window--wide or narrow as possible--will get the link working at the bottom of the window. Sometimes a page reload will get the link not working again. Finally, it's rare but sometimes a low-on-the-page link does work. I don't see a common denominator yet. I have no extensions enabled, and clearing website data had no effect. I added a new user account to my Mac and Safari works fine on that login. How do I even debug this? UPDATE On first launch of Safari, link behaves. Drag right edge of window back & forth then let go at a (probably) different size than original, and the bad behavior returns. Same result with shift-click launch of Safari UPDATE 2 Using Web Inspector, I set a breakpoint on the link's click event which is in some website-local javascript. When the link is scrolled low on the window the click even doesn't happen; scrolled high I get the breakpoint. So what could be making Safari not fire the click for an element it's happy to highlight? Thanks for insight.