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Link to “Intent to Deprecate” thread
The deprecation landed in M41:
Usage information from UseCounter
Usage hasn't changed much since deprecation it's still ~0.01%.
Entry on chromestatus.com
None, just https://crbug.com/438392
Forms may be posted and scripts/stylesheets loaded with the wrong encoding. (They would in Firefox as well, unless it's a non-Gecko code path.)
Judging by a quick grep of the 20150101 httparchive data, the most common way this is used is to set an encoding immediately before form submission. Some are conditional on IE sniffing and based on a Stack Overflow question I suspect that working around an old IE bug explains some of the usage. For per-form control over encoding, the accept-charset attribute is a suitable replacement.
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