According to Steam it works in the Steam Client, Google Chrome, and Safari: https://support.steampowered.com/kb_article.php?ref=6730-TOAK-6497#18 https://suppor

According to Steam it works in the Steam Client, Google Chrome, and Safari: https://support.steampowered.com/kb_article.php?ref=6730-TOAK-6497#18 https://support.steampowered.com/kb_article.php?ref=6730-TOA... If they just say 'Safari', it probably doesn't work on iOS at the moment. But it should work on your Mac unless an extension/addon is interfering.