Anyone whose website looks like this [1] has no business complaining about underlines.
My personal website is a playground for ideas; it is not a product anyone payed me to build, and it is not intended to sell anything. The fixed semi-transparent nav is an attempt to balance my annoyance with fixed navs that break page down/page up functionality with the utility of having quick access to useful links (use case being “interesting post, who is this person?” or “what else have they done?”). I don’t love it, and it’s pretty bad at mobile widths, but it has the distinct advantage of preventing readers from losing their place when paging. Another commenter picked up on that: https://news.ycombinator.com/item?id=8679336
Anyways, I appreciate the criticism. Though I heartily disagree that as a result of that expirement, I cannot write about improving text underlining on the web.
If your intention was to be helpful in any way (always a safe assumption with username223), you could have at least said what browser you use.
In a half-hearted attempt to atone for my sins...
My browser is Safari blocking some JavaScript and most ads. Your floating header-menu-thingy is completely transparent, but won't disappear. Floating headers generally break page-down, so they're a terrible idea. But if you use them, at least make them opaque so people can figure out the breakage.
I'm not the article author or site creator, I'm just OCD about the myriad ways a seemingly simple page can fail to render.