This issue applies to Chinese and Japanese.

In Chinese and Japanese composition, it is usually recommended to apply extra spacing between Chinese/Japanese and Western text to increase the recognition of Western text.

Currently, browsers do not support this feature, so content authors have to work around the problem by adding spaces manually.

See also requirements inChinese andJapanese.

Specs:
‘text-autospace: ideograph-alpha ideograph-numeric’ in thecss-text specification can be used to create 1/4em extra spacing between runs of ideographs and non-ideographic letters/numerals.

Tests & results:
Interactive test‘text-autospace: ideograph-alpha ideograph-numeric’ should create 1/4em extra spacing between runs of ideographs and non-ideographic letters/numerals

Gecko, Blink, and Webkit browsers all fail to add the 1/4em extra spacing between runs of ideographs and non-ideographic letters.

Browser bug reports:
Gecko •Blink 1 •Blink 2 •Webkit 1 •Webkit 2

Priority:
Given that a workaround is possible, though not ideal, this is prioritised as an advanced issue.