- if ( type === 'flag' ) {
- /*
- * This works because the image will be one of three things:
- * - Two empty squares, if the browser doesn't render emoji
- * - Two squares with 'G' and 'B' in them, if the browser doesn't render flag emoji
- * - The British flag
- *
- * The first two will encode to small images (1-2KB data URLs), the third will encode
- * to a larger image (4-5KB data URL).
- */
- context.fillText( String.fromCharCode( 55356, 56812, 55356, 56807 ), 0, 0 );
- return canvas.toDataURL().length > 3000;
- } else {
- /*
- * This creates a smiling emoji, and checks to see if there is any image data in the
- * center pixel. In browsers that don't support emoji, the character will be rendered
- * as an empty square, so the center pixel will be blank.
- */
- context.fillText( String.fromCharCode( 55357, 56835 ), 0, 0 );
- return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0;
+ switch ( type ) {
+ case 'flag':
+ /*
+ * This works because the image will be one of three things:
+ * - Two empty squares, if the browser doesn't render emoji
+ * - Two squares with 'A' and 'U' in them, if the browser doesn't render flag emoji
+ * - The Australian flag
+ *
+ * The first two will encode to small images (1-2KB data URLs), the third will encode
+ * to a larger image (4-5KB data URL).
+ */
+ context.fillText( stringFromCharCode( 55356, 56806, 55356, 56826 ), 0, 0 );
+ return canvas.toDataURL().length > 3000;
+ case 'diversity':
+ /*
+ * This tests if the browser supports the Emoji Diversity specification, by rendering an
+ * emoji with no skin tone specified (in this case, Santa). It then adds a skin tone, and
+ * compares if the emoji rendering has changed.
+ */
+ context.fillText( stringFromCharCode( 55356, 57221 ), 0, 0 );
+ tonedata = context.getImageData( 16, 16, 1, 1 ).data;
+
+ context.fillText( stringFromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 );
+ // Chrome has issues comparing arrays, and Safari has issues converting arrays to strings.
+ // So, we create our own string and compare that, instead.
+ tonedata = context.getImageData( 16, 16, 1, 1 ).data;
+ tone2 = tonedata[0] + ',' + tonedata[1] + ',' + tonedata[2] + ',' + tonedata[3];
+
+ return tone !== tone2;
+ case 'simple':
+ /*
+ * This creates a smiling emoji, and checks to see if there is any image data in the
+ * center pixel. In browsers that don't support emoji, the character will be rendered
+ * as an empty square, so the center pixel will be blank.
+ */
+ context.fillText( stringFromCharCode( 55357, 56835 ), 0, 0 );
+ return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0;
+ case 'unicode8':
+ /*
+ * To check for Unicode 8 support, let's try rendering the most important advancement
+ * that the Unicode Consortium have made in years: the burrito.
+ */
+ context.fillText( stringFromCharCode( 55356, 57135 ), 0, 0 );
+ return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0;