| Entry | Meaning |
| Q | Quirks mode |
| S | Strict mode |
| - | Status unknown |
| DOCTYPE given | NN6.01 | NN6.1 | NN6.2 | IE5/Mac | IE6/Win |
|---|
| No DOCTYPE given |
Q |
Q |
Q |
Q |
Q |
|---|
| Unrecognized DOCTYPE |
Q |
Q |
Q |
S |
S |
|---|
| Unrecognized DOCTYPE + URL |
Q |
Q |
Q |
S |
S |
|---|
| HTML (no version given) |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML (no version given) + URL |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 2.0 |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 2.0 + URL |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 3.0 |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 3.0 + URL |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 3.2 |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 3.2 + URL |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 4.0 (no type given) |
S |
S |
S |
S |
S |
|---|
| HTML 4.0 (no type given) + URL |
S |
S |
S |
S |
S |
|---|
| HTML 4.0 Frameset |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 4.0 Frameset + URL |
Q |
Q |
Q |
S |
S |
|---|
| HTML 4.0 Transitional |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 4.0 Transitional + URL |
Q |
Q |
Q |
S |
S |
|---|
| HTML 4.0 Strict |
S |
S |
S |
Q |
S |
|---|
| HTML 4.0 Strict + URL |
S |
S |
S |
S |
S |
|---|
| HTML 4.01 (no type given) |
S |
S |
S |
Q |
S |
|---|
| HTML 4.01 (no type given) + URL |
S |
S |
S |
S |
S |
|---|
| HTML 4.01 Frameset |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 4.01 Frameset + URL |
S |
S |
S |
S |
S |
|---|
| HTML 4.01 Transitional |
Q |
Q |
Q |
Q |
Q |
|---|
| HTML 4.01 Transitional + URL |
S |
S |
S |
S |
S |
|---|
| HTML 4.01 Strict |
S |
S |
S |
Q |
S |
|---|
| HTML 4.01 Strict + URL |
S |
S |
S |
S |
S |
|---|
| Any XHTML version |
S |
S |
S |
S |
S |
|---|
| Any XHTML version + URL |
S |
S |
S |
S |
S |
|---|
| Any XML |
S |
S |
S |
S |
S |
|---|
| Any XML + URL |
S |
S |
S |
S |
S |
|---|