// Flag 1

var flag = test( [55356, 56826, 55356, 56819] );

​

// Flag 2

var flag2 = test( [55356, 56826, 8203, 55356, 56819] );

​

​

// Display outcome

var p = document.createElement( 'p' );

document.body.appendChild( p );

​

if ( flag !== flag2 ) {

    // return false ( flag === flag2 )

    p.innerText = 'Outcome: false (fail)';

}

​

p.innerText = 'Outcome: true (pass)';

​

​

// Moves on to GB test.

// Returns flag !== flag2

​

​

​

​

​

​

​

​

​

​

​

// Test

function test( code ) {

  var stringFromCharCode = String.fromCharCode;

  var canvas = document.createElement( 'canvas' );

  var context = canvas.getContext && canvas.getContext( '2d' );

  canvas.width = canvas.height = 100;

  context.textBaseline = 'top';

  context.font = '600 32px Arial';

  context.fillText( stringFromCharCode.apply( this, code ), 0, 0 );

  document.body.appendChild( canvas );

​

  // Result

  return canvas.toDataURL();

}

​