createElement method Null safety

Element createElement (
  1. String tagName,
  2. [String? typeExtension]
)

Implementation

@pragma('dart2js:tryInline') // Almost all call sites have one argument.
Element createElement(String tagName, [String? typeExtension]) {
  return (typeExtension == null)
      ? _createElement_2(tagName)
      : _createElement(tagName, typeExtension);
}