labelWidget label; interactive widgets also use it for ID generation. A ## suffix can distinguish IDs without displaying the suffix.
bufWritable NUL-terminated UTF-8 Uint8Array; edits update its bytes in place.
buf_sizeWritable capacity in bytes including the final NUL; must not exceed buf.byteLength.
True when the text changes; the edited UTF-8 bytes are written into the supplied buffer.
Display a text field for editing multiple lines of text.