Remove redundant <dl> wrapper for the attribute table + prose block of each element

[AmeliaBR]

A list with one entry is just confusing for screen reader users, especially when the "term" is a table containing <dfn> elements. The list structure is not visible at all for other users.

[AmeliaBR]

As I noted in #219, some chapters don't use this structure.

I think I prefer the format that most elements in the paint server chapter use: a definition list, with the name of the attribute as the <dt>, then the <dd> contains:

• a max one-line description
• a box with with the value syntax, initial value, and animatable status,
• keyword value descriptions as a nested definitions list
• the prose description.

If we want to keep the attribute name inside the blue boxes, then we shouldn't use a definition list format: a table doesn't make sense as a definition term.

[dirkschulze]

@AmeliaBR I suppose you mean a template like the one used for markerUnits?

From accessibility point of view this should be fine though on a sequential reading one hears all headers first followed by the individual rows with values like attr name, value type and so on. IMO could be better eventhough a11y software does allow navigation in tables.

startOffset probably is an example of "blue boxes". This has nested <dl>'s. @AmeliaBR is it that what you did not like or feel is not as accessible as the first example?

Note that the 2nd example is very common in CSS specs. It might even be the only pattern used by CSS specs and seems to be more accessible for sequential only reading. Would you disagree?

[svgeesus]

If the nested dl formatting is sufficiently accessible and also is what bikeshed generates, we should use that for SVG vs. CSS spec consistency. If it is not, then it needs discussion on the bikeshed repo, and if there is agreement bikeshed should get a PR for the change and we should also change to use that new formatting (again for SVG vs. CSS spec consistency).

If agreement is not reached fairly rapidly, this should be punted to the 2.1 milestone.