omitting a TH in the top left cell causes bugs where VO incorrectly reads the wrong headers
Apples
Oranges
Bananas
Q1
100
200
250
Q2
120
180
230
Q3
110
120
210
Q4
140
150
300
using headers="id1 id2" does NOT work with VO
Quarter
Apples
Oranges
Bananas
Q1
100
200
250
Q2
120
180
230
Q3
110
120
210
Q4
140
150
300
using th as row and column headers in the second row and second column does NOT work with VO
0
1
2
3
4
1
Quarter
Apples
Oranges
Bananas
2
Q1
100
200
250
3
Q2
120
180
230
4
Q3
110
120
210
5
Q4
140
150
300
using headers to point to row headers in 2nd colum does not work in VO or JAWS, only works in NVDA/Firefox, this test is to determine link purpose using a programmatically determined context