[wp-trac] [WordPress Trac] #49696: Define guidelines for minimum IE support

[WordPress Trac]

#49696: Define guidelines for minimum IE support
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 Reporter:  isabel_brison   |       Owner:  (none)
     Type:  task (blessed)  |      Status:  new
 Priority:  normal          |   Milestone:  Future Release
Component:  General         |     Version:
 Severity:  normal          |  Resolution:
 Keywords:                  |     Focuses:  accessibility, javascript, css
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Comment (by isabel_brison):

 > The people stuck on IE are often in government or financial sectors and
 are prohibited by law from upgrading things.

 Too true. I used to work for a major Australian financial news website
 and, as of mid-last year, about 15% of desktop traffic came from IE11.

  > We need to be very thoughtful and careful about what we break and how
 we handle workarounds.

 Yes! This is why I think having clear guidelines would be so useful.

 > It would not be a bad idea to have an 'IE Compatibility Pack' type
 plugin to restore old functionality for these people in terrible
 situations.

 Oooh, thanks for the suggestion @Ipstenu ! Definitely worth looking into.

 My reasons for raising this now are mostly Gutenberg-related, but I'm
 raising it here as ideally we should have a single strategy for the whole
 of core.

 * CSS custom properties (not supported by IE) are seeing some use in
 Gutenberg: https://github.com/WordPress/gutenberg/pull/20047
 * Not all Gutenberg features are manually tested on IE before being
 merged. We have some basic automated checks for JS, and there's a ticket
 open for adding some e2e tests:
 https://github.com/WordPress/gutenberg/issues/16509.

 Clear guidelines around what absolutely ''can't'' be broken will help with
 development, and can also help us define what we should be testing for.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49696#comment:17>
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