HtmlEscapeMode SQ_ATTRIBUTE = const HtmlEscapeMode._('attribute', true, false, true, false)

Escaping mode for text going into single-quoted HTML attribute values.

The result should not be used as the content of an unquoted or double-quoted attribute value.

Escapes single quotes (') but not double quotes ("), and escapes < and > characters because they are not allowed in strict XHTML attributes