RFC 179: Remove support for Internet Explorer and Microsoft Edge Legacy

Author: mwjacksonmsft

rfcs/remove_ie_edge_legacy.md

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+# RFC 179: Remove support for Internet Explorer and Microsoft Edge Legacy
+
+### Summary
+
+Remove support for running WPT tests in Internet Explorer and Microsoft Edge
+Legacy.
+
+### Details
+
+Support for the Microsoft Edge Legacy desktop application ended on March 9,
+2021[1], and support for the Internet Explorer desktop application ended on
+June 15, 2022[2].
+
+The proposal is to remove the `edge`, `edge_webdriver`, and `ie` options from
+the product parameter to `wpt run`, along with all related code.
+
+After removal, the remaining supported products would be:
+
+```
+[--product {android_weblayer,android_webview,chrome,chrome_android,chrome_ios,
+chromium,content_shell,edgechromium,firefox,firefox_android,safari,sauce,servo,
+servodriver,opera,webkit,webkitgtk_minibrowser,wktr,epiphany,ladybird}]
+```
+
+[1] https://blogs.windows.com/msedgedev/2021/03/09/microsoft-edge-legacy-end-of-support/
+
+[2] https://blogs.windows.com/windowsexperience/2022/06/15/internet-explorer-11-has-retired-and-is-officially-out-of-support-what-you-need-to-know/
+
+
+### Risks
+
+* Someone running WPT tests against these browsers would now be broken.