Table 3.

Percentage of errors found on PPI library homepages per October 2020 analysis

Specific error	Percentage of total errors
Very low contrast non-508	50.71
Missing form label 508(n)	11.61
Empty link 508(c)	10.28
Empty button 508(a)	8.35
Linked image missing alternative text 508(a)	6.52
Multiple form labels 508(n)	3.59
Broken ARIA menu 508(c)	2.92
Broken ARIA reference 508(c)	1.75
Empty heading 508(o)	1.5
Missing alternative text 508(a)	1.34
Empty table header 508(g), 508(h)	0.75
Spacer image missing alternative text 508(a)	0.25
Language missing or invalid non-508	0.25
Broken skip link 508(o)	0.08
Empty form label 508(n)	0.08