[wp-meta] [Making WordPress.org] #3992: Gutenberg Theme: Add old-browser fallback

[Making WordPress.org]

#3992: Gutenberg Theme: Add old-browser fallback
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 Reporter:  dd32         |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  low          |  Milestone:
Component:  General      |   Keywords:
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 Currently the Gutenberg theme in old browsers is broken as it requires
 more modern browsers.

 One particular error in IE9 is `'Blob' is undefined' which makes sense as
 that's not available until IE10.

 Additionally, we should consider some 'richEditing' fallback as shown by
 [7970] and https://github.com/WordPress/gutenberg/issues/12772

 I think we might be able to get away with a large centered block which
 suggests the browser is too out of date, linking off to
 https://browsehappy.com/ and maybe mentioning Gutenbergs browser
 requirements.

 For reference, I'm attaching what it currently looks like in IE9.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/3992>
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