attribute constant Null safety
Escaping mode for text going into double-quoted HTML attribute values.
The result should not be used as the content of an unquoted or single-quoted attribute value.
Escapes double quotes (
") but not single quotes (
> characters because they are not allowed
in strict XHTML attributes
static const HtmlEscapeMode attribute = HtmlEscapeMode._('attribute', true, true, false, false);