Extended character testing

  ℹ   information source, U+2139
  ⏩   black right-pointing double triangle, U+23E9
  ⏪   black left-pointing double triangle, U+23EA
  ⏫   black up-pointing double triangle, U+23EB
  ⏬   black down-pointing double triangle, U+23EC
  ▪   black small square, U+25AA
  ▫   white small square, U+25AB
  ◽   white medium small square, U+25FD
  ◾   black medium small square, U+25FE
  ◻   white medium square, U+25FB
  ◼   black medium square, U+25FC
  ⬜   Large white square, U+2B1C
  ⬛   Large black square, U+2B1B
  ☑   ballot box with check, U+2611
  ⚪   white circle, U+26AA
  ⚫   black circle, U+26AB
  🔴   red circle, U+1F534
  🔵   blue circle, U+1F535
  🔘   radio button, U+1F518
  🔲   black square button, U+1F532
  🔳   white square button, U+1F533
  🏕   camping, U+1F3D5
  ⛺   tent, U+26FA
  ⛽   fuel pump, U+26FD
  ✅   white heavy check mark, U+2705
  ✔   heavy check mark, U+2714
  ✳   eight spoked asterisk, U+2733
  ❎   negative squared cross mark, U+274E
  ➡   rightward black arrow, U+27A1
  ⬅   leftward black arrow, U+2B05
  ⬆   upward black arrow, U+2B06
  ⬇   downward black arrow, U+2B07
  🔍   magnifying glass tilted left, U+1F50D
  🔎   magnifying glass tilted right, U+1F50E
  📖   open book, U+1F4D6
  ⚙   gear, U+2699

Observations

Don't get too attached to what these look like.  They render quite differently from platform to platform, and they render differently in Chrome versus in Safari on a Mac.

These extended characters render in Safari on iOS 9, but they don't scale with alphanumberic characters when size is adjusted in em as they should.  Maybe they scale a litte, but not as much as they should, not as much as alphanumeric characters do.