| PASS | Constructing a CSSSkew with a keyword throws a TypeError | |
| PASS | Constructing a CSSSkew with a double throws a TypeError | |
| PASS | Constructing a CSSSkew with a unitless zero throws a TypeError | |
| PASS | Constructing a CSSSkew with a string angle throws a TypeError | |
| PASS | Constructing a CSSSkew with a number CSSUnitValue throws a TypeError | |
| PASS | Constructing a CSSSkew with a time dimension CSSUnitValue throws a TypeError | |
| PASS | Constructing a CSSSkew with a CSSMathValue of length type throws a TypeError | |
| PASS | Updating CSSSkew.ax with a keyword throws a TypeError | |
| PASS | Updating CSSSkew.ax with a double throws a TypeError | |
| PASS | Updating CSSSkew.ax with a unitless zero throws a TypeError | |
| PASS | Updating CSSSkew.ax with a string angle throws a TypeError | |
| PASS | Updating CSSSkew.ax with a number CSSUnitValue throws a TypeError | |
| PASS | Updating CSSSkew.ax with a time dimension CSSUnitValue throws a TypeError | |
| PASS | Updating CSSSkew.ax with a CSSMathValue of length type throws a TypeError | |
| PASS | Updating CSSSkew.ay with a keyword throws a TypeError | |
| PASS | Updating CSSSkew.ay with a double throws a TypeError | |
| PASS | Updating CSSSkew.ay with a unitless zero throws a TypeError | |
| PASS | Updating CSSSkew.ay with a string angle throws a TypeError | |
| PASS | Updating CSSSkew.ay with a number CSSUnitValue throws a TypeError | |
| PASS | Updating CSSSkew.ay with a time dimension CSSUnitValue throws a TypeError | |
| PASS | Updating CSSSkew.ay with a CSSMathValue of length type throws a TypeError | |
| PASS | CSSSkew can be constructed from an angle CSSUnitValue and an angle CSSUnitValue | |
| PASS | CSSSkew can be constructed from an angle CSSUnitValue and a CSSMathValue of angle type | |
| PASS | CSSSkew can be constructed from a CSSMathValue of angle type and an angle CSSUnitValue | |
| PASS | CSSSkew can be constructed from a CSSMathValue of angle type and a CSSMathValue of angle type | |
| PASS | CSSSkew.ax can be updated to an angle CSSUnitValue | |
| PASS | CSSSkew.ax can be updated to a CSSMathValue of angle type | |
| PASS | CSSSkew.ay can be updated to an angle CSSUnitValue | |
| PASS | CSSSkew.ay can be updated to a CSSMathValue of angle type | |
| PASS | Modifying CSSSkew.is2D is a no-op | |