186234 2018-06-02 06:56:59 -0700 Tag ID's can start with a number 2018-06-02 07:53:59 -0700 1 1 1 Unclassified WebKit DOM Safari 11 All All RESOLVED INVALID P2 Normal --- 1 blake1024 webkit-unassigned cdumez oldest_to_newest 1429554 0 341846 blake1024 2018-06-02 06:56:59 -0700 Created attachment 341846 Shows the problem Steps to reproduce: Run the attached script. Actual results: Displayed: AAA in red AAA no color Expected results: AAA in red AAA in blue Safari doesn't work if a tag's ID is all numeric. The current HTML spec states: "IDs can consist of just digits, start with a digit, start with an underscore, consist of just punctuation, etc." See: https://www.w3.org/TR/html5/dom.html#element-attrdef-global-id 1429557 1 blake1024 2018-06-02 07:33:02 -0700 HTML specification is not applicable to CSS selectors. Per the CSS specification: an all-numeric id should be escaped, see https://www.w3.org/International/questions/qa-escapes#css_identifiers However, if you change the CSS selector to #\222 it still doesn't work. 1429559 2 blake1024 2018-06-02 07:53:16 -0700 I now see that \2 is not a "2"... It should be #\32 22 as you can see in the examples of CSS escaping linked above. 341846 2018-06-02 06:56:59 -0700 2018-06-02 06:56:59 -0700 Shows the problem test4.html text/html 372 blake1024 PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KCjxoZWFkPgogIDxtZXRhIGNoYXJzZXQ9 IlVURi04Ij4KICA8bWV0YSBuYW1lPSJ2aWV3cG9ydCIgY29udGVudD0id2lkdGg9ZGV2aWNlLXdp ZHRoLCBpbml0aWFsLXNjYWxlPTEsIHNocmluay10by1maXQ9bm8iPgogIDxzdHlsZT4KICAgICNh YWEgewogICAgICAgIGJhY2tncm91bmQtY29sb3I6IHJlZDsKICAgIH0KICAgICMyMjIgewogICAg ICAgIGJhY2tncm91bmQtY29sb3I6IGJsdWU7CiAgICB9CiAgPC9zdHlsZT4KCjwvaGVhZD4KPGJv ZHk+CiAgCiAgPHNwYW4gaWQ9ImFhYSI+QUFBPC9zcGFuPgogIDxicj4KICA8c3BhbiBpZD0iMjIy Ij5BQUE8L3NwYW4+Cgo8L2JvZHk+CjwvaHRtbD4K