,? not ?,

[sidewayss]

These changes reflect the way the spec does it here, at the very top of this section: https://svgwg.org/svg2-draft/coords.html#ViewBoxAttribute

[<min-x>,? <min-y>,? <width>,? <height>]

I assume that this docs page is intending to imitate the spec on this, but I am not even certain what the ? means. I think it means that these arguments are optional, thus that viewBox requires only one argument. I am submitting this PR largely because I want to find out for certain what the ? means here and in the spec. I don't see any glossary that explains it anywhere. Maybe you can point me to one.

[github-actions]

Preview URLs

• /en-US/docs/Web/SVG/Attribute/viewBox

[wbamberg]

I'm not that familiar with the SVG doc conventions (and I guess at this point noone is) but:

• I think the syntax here is the same as the CSS formal syntax, that we have in places like https://developer.mozilla.org/en-US/docs/Web/CSS/font#formal_syntax and that we document at https://developer.mozilla.org/en-US/docs/Web/CSS/Value_definition_syntax
• AFAICT your PR here is good

I don't know why we repeat the syntax 5 times, once for every element that can use the attribute. But like I say, not an expert on the SVG docs conventions. Really the SVG docs need a huge amount of work to get them up to scratch :(.

[sidewayss]

So you're saying that the ? means it's an optional arg? I don't see a glossary or map of keys for all the symbols in the formal syntaxes you reference, so I'm just making sure. Is there a glossary/keys/legend or whatever for the formal syntax callouts here? I always skim over them because I'm often unsure how to parse them, and some of them are relatively long-winded, like font.

[wbamberg]

So you're saying that the ? means it's an optional arg?

Yes.

I don't see a glossary or map of keys for all the symbols in the formal syntaxes you reference, so I'm just making sure. Is there a glossary/keys/legend or whatever for the formal syntax callouts here?

Formal syntax is documented at https://developer.mozilla.org/en-US/docs/Web/CSS/Value_definition_syntax.

The formal syntax in CSS property &c pages uses tooltips to give a quick summary of the syntax, and the syntax also links to the relevant bit of https://developer.mozilla.org/en-US/docs/Web/CSS/Value_definition_syntax. For example, https://developer.mozilla.org/en-US/docs/Web/css/font#formal_syntax includes ? - if you hover over it, you get the tooltip, if you click it you go to https://developer.mozilla.org/en-US/docs/Web/CSS/Value_definition_syntax#question_mark.

I always skim over them because I'm often unsure how to parse them, and some of them are relatively long-winded, like font.

They are sometimes long and complicated to parse, but IMO it is worth learning the basics, as they give you a very precise explanation of CSS syntax.

[sidewayss]

They are sometimes long and complicated to parse, but IMO it is worth learning the basics, as they give you a very precise explanation of CSS syntax.

That's why I asked. Thanks!