Tag spaces

This post relies on subresources (styles and scripts) that your feed reader will not load. You may want to click through for this one. While chatting with Anne the other day I casually asserted that you obtain a tag from <a rel=tag href> by extracting the final path segment from its href attribute. Consider this HTML fragment: When he got <a href=https://en.wikipedia.org/wiki/De­fen­e­stra­tion rel=tag>de­fen­e­stra­ted</a>, he was fortunate to land in a bale of hay that happened to be in a wheelbarrow on the sidewalk below. A link marked rel=tag I thought the spec said, somewhere, that "De­fen­e­stra­tion" is the tag here (and not, say, "de­fen­e­stra­ted"). But that’s not the case. Neither of those is the case. What the spec actually says is that the entire URL is the tag: "https://en.wikipedia.org/wiki/De­fen­e­stra­tion". I doubt this matches anybody’s mental model of how rel=tag works. Later on I remembered that this is an aspect of the rel=tag mi­cro­for­mat that didn’t make the…