I don't think this can be skipped, because the other conditions are not conditional upon the element not having attributes.

I had to read that statement a few times and am not sure I understand 🙂

Maybe taking a step back, how can one omit a start tag that has attributes, if attributes can only be set on start tags?

From going over the section it doesn’t look like it wouldn’t work without the sentence (or some rephrasing to make clear what omitting a start tag means in the context of attributes being present).

Even if this was to miss something, the spec might get clearer by explaining it to everyone.

Given this statement:

A head element's start tag may be omitted if the element is empty, or if the first thing inside the head element is an element.

It's not at all clear that this only applies when the head element has no attributes. That's what that final statement is for.

Thanks for sharing more context. I’m still not clear about the value of the sentence in question (which humbly includes I might just not get something), but if it’s important to make head element handling clear, how about adding a qualifier right there?

Like, “A head element’s start tag may be omitted if the element has no attributes, is empty, or if the first thing inside the head element is an element.” (if that’s what this is referring to)?

Sure, but then we'd have to add that clause for each element whose start tag may be omitted. Instead we use a catch-all clause at the end.

It sounded like this was just to be extra sure about the head element.

There’s still the question how authors would omit a start tag if there are attributes on it, also given that attributes can only be set on start tags.

Assuming it’s possible or likely, how about two adjustments:

1. Rephrase the note as something more informal, like “Note that a start tag cannot and must not be omitted if it has any attributes.”

2. Move the note up to come before the examples, and in closer proximity to the other statements (right after “A th element's end tag may be omitted…”).

If I understood you right, that could meet the spirit of the sentence while making the section a bit more easier to read.

I think Jens is right: that statement as currently written isn’t correct. The actual intent of the requirement regards whether the start tag’s element has attributes — not about whether the start tag itself does. The problem with the text are currently written is the word “it”, which incorrectly refers to the start tag itself. So I’ve raised #10752 with an attempt at fixing that.

(Love the proactive PR!)

The actual intent of the requirement regards whether the start tag’s element has attributes — not about whether the start tag itself does.

More of a side note but would love to learn—have I been missing something here, am I not seeing the forest for the trees? How can an author omit a start tag—or an element—that has attributes?

Anne’s and your response both seem to indicate that it’s possible, but I don’t understand it—I’d appreciate if someone could explain, especially when I’m missing something obvious. I only see something like < attribute=value> (or, more interesting but also more esoteric, </ attribute=value>), which seems nonsensical but also sufficiently described in the spec and handled by every browser (leading to a text node, IIRC) not to warrant calling out not to do it. I feel like I’m losing my mind over this 😂

(While I conceded earlier when Anne suggested this was just about the head element, that didn’t actually make it clear to me, either.)

Thanks!

The phrasing is a little odd, but it's talking about what transformations you can perform without changing the resulting DOM (and which ones you can't, because it would result in a change). For example, you can omit the html start tag if its first child isn't a comment, because you'll get the same DOM back (but if the first child is a comment, omitting the start tag would cause the comment to parse as a sibling of the html instead).

Similarly, you can't omit a start tag if it has attributes (because the resulting DOM will then lack those attributes).