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 ('), and escapes < and > characters because they are not allowed in strict XHTML attributes
static const HtmlEscapeMode attribute =
const HtmlEscapeMode._('attribute', true, true, false, false)
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-convert/HtmlEscapeMode/attribute-constant.html