We have made extensive use of macro parameters throughout the tutorials. In most cases, like when specifying the class value, we don't have to worry about problematic characters. That's not the case for value or text parameters.
Single quotes ', column separation | and other characters can disrupt the Wmacro syntax. The best practice when dealing with text messages is to double quote " the value.
@w{label(class=teal,text="Any text or character")}
The text property is double-quoted, despite the fact that has no problematic characters. This is a good practice, because you don't need to worry when modifying the value.
When the value includes double quotes, use the HTML entity "
@w{label(class=teal,text="Double quotes " in value")}