Catch DOMException when accessing the 'contentDocument' property from a cross-origin frame
Catch DOMException when accessing the 'contentDocument' property from a cross-origin frame

cheton/piduino-grbl,cncjs/cncjs,cheton/piduino-grbl,cheton/cnc,cncjs/cncjs,cncjs/cncjs,cheton/cnc.js,cheton/cnc.js,cheton/cnc,cheton/piduino-grbl,cheton/cnc.js,cheton/cnc