| Yes | Supported completely and correctly |
| Almost | Supported completely and correctly except for a minor issue |
| Incom |
Supported correctly but not completely |
| Alter |
Supported in an alternative way |
| Untest |
Depends on another method or property that is not supported |
| Minimal | Just barely supported but unusable in practice |
| Incor |
Returns incorrect object or value and becomes badly usable |
| Buggy | Does something it should not do |
| No | Not supported |
| Crash | Crashes browser |