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