(readAsText) : Use 'optional' instead of [Optional] following the current Web IDL editor's draft.
(readAsText) : Use 'optional' instead of [Optional] following the current Web IDL editor's draft.
mattl/es-operating-system,mattl/es-operating-system,mattl/es-operating-system,mattl/es-operating-system,mattl/es-operating-system,mattl/es-operating-system,mattl/es-operating-system