Between 2007 and 2009, Internet Explorer 6 was still a thing. It was incredibly daring on YouTube’s part to put up a “Internet Explorer is deprecated” banner b

Between 2007 and 2009, Internet Explorer 6 was still a thing. It was incredibly daring on YouTube’s part to put up a “Internet Explorer is deprecated” banner back in 2009; it had to be done without official approval. [1] In 2011, “display: table” was cutting edge; we finally had few enough IE6 and IE7 users that it was practical to pull off, albeit with “<!--[if IE lt 8]><table><tr><td><![endif]-->” hacks. I still had to deal with IE-specific bugs like the fact webfonts didn’t work in IE8 when put in an IFRAME — but did work in IE9 when rendering in IE8 mode. This wasn’t limited to IE: Safari had a bug where you couldn’t legibly print a page with webfonts on them, requiring a Safari-specific hack to disable webfonts in the print CSS. Professional web developers were not using stuff like “display: flex” or “display: grid” in production until the late 2010s, when Edge and Chrome was finally reducing the number of Internet Explorer uses to a sane level. [1] https://blog.chriszacharias.com/a-conspiracy-to-kill-ie6 https://blog.chriszacharias.com/a-conspiracy-to-kill-ie6