optional constant
String
const optional
Implementation
static const String optional =
'<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="48" height="48" preserveAspectRatio="xMidYMid meet" viewBox="0 0 48 48"><g fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="4"><path d="M39 6H9a3 3 0 00-3 3v30a3 3 0 003 3h30a3 3 0 003-3V9a3 3 0 00-3-3Z"/><path d="m14 28 8-8 4 7 8-8"/></g></svg>';