td-headers-attr docs mostly about using [scope]

[paulirish]

the https://dequeuniversity.com/rules/axe/3.3/td-headers-attr doc is quite confusing to me.

there is no example of a table using [headers] attribute (either incorrectly or correctly).. only a correct example using scope.

[straker]

cc @jeankaplansky

[jeankaplansky]

Added link to https://www.w3.org/WAI/WCAG21/Techniques/html/H43 in the How to Fix section - this example demonstrates associating IDs with headers attribute values on specific table cells.

[chandana7393]

Tested, there is no https://www.w3.org/TR/WCAG20-TECHS/H43.html link in the Fix the following,

Tested Environment:
Axe-coconut - 4.0.0.29404v
Chrome - 77.0.3865.120v
OS - Windows 10 64 bit.

[jeankaplansky]

@chandana7393 : Not sure what you mean. There's no https://www.w3.org/WAI/*WCAG21*/Techniques/html/H43 in the UI, or in the rule help? Because the link is definitely in the rule help in the "Other Resources" section at the bottom of the page.

Also - It's not impossible that you checked this and the updated rule hadn't been picked up from github over to DQU quite yet. We're pulling rule help directly from Github every 45 minutes now. @paulbohman: please advise?

@straker: Can you offer any insight into what axe-coconut is doing regarding how it points to rule help?

Thanks!

[jeankaplansky]

More new content added with examples demonstrating the use of scope="colgroup", scope="rowgroup", and IDs and headers attribute values in addition to the original example.

Latest link is here: https://dequeuniversity.com/rules/axe/3.4/td-headers-attr

[chandana7393]

@jeankaplansky Thanks for the clarification.
Verified accordingly, there are headers examples updated in the Learn more link and also "https://www.w3.org/WAI/*WCAG21*/Techniques/html/H43" link is present under the other resources of deque University 'Learn More' link.

Tested Environment:
Axe-coconut - 4.0.0.29504v
Chrome - 77.0.3865.120v
OS - Windows 10 64 bit.