Identify row and column headers in data tables using th elements, and mark layout tables with role=presentation

[Horlix]

HTML tables need to ensure they are using the correct markup.

For example https://ubuntu.com/blog/a-snap-confined-shell-based-on-mir-mircade has no thead or th.

This is the same for other pages including:

• https://ubuntu.com/blog/blender-support-from-canonical
• https://ubuntu.com/blog/canonical-certifies-big-software-solutions-at-menlo-park
• https://ubuntu.com/blog/cis-security-compliance-usg
• https://ubuntu.com/blog/cloud-paas-through-the-lens-of-open-source-opinion
• https://ubuntu.com/blog/data-centre-networking-software-defined-data-centre

Full list of pages can be provided, currently this is a affecting 50 pages

[Horlix]

Full set of URLs

Identify row and column headers in data tables using th elements, and mark layout tables with role=presentation.csv