| PASS | Calling StylePropertyMap.append with an unsupported property name throws TypeError | |
| PASS | Calling StylePropertyMap.append with an null property name throws TypeError | |
| PASS | Calling StylePropertyMap.append with a property that is not list valued throws TypeError | |
| PASS | Calling StylePropertyMap.append with a shorthand property throws TypeError | |
| PASS | Calling StylePropertyMap.append with an invalid CSSStyleValue throws TypeError | |
| PASS | Calling StylePropertyMap.append with an invalid String value throws TypeError | |
| PASS | Calling StylePropertyMap.append with a mix of valid and invalid values throws TypeError | |
| PASS | Calling StylePropertyMap.append with a CSSUnparsedValue throws TypeError | |
| PASS | Calling StylePropertyMap.append with a var ref throws TypeError | |
| PASS | Appending a list-valued property with CSSStyleValue or String updates its values | |
| PASS | Appending a list-valued property with list-valued string updates its values | |
| PASS | StylePropertyMap.append is case-insensitive | |
| PASS | Appending to a list containing a variable reference should throw | |
| PASS | Appending to a longhand list containing a variable reference should throw | |