UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:64.0) Gecko/20100101 Firefox/64.0

Example URL:

Steps to reproduce the problem:
1. load attached html
2. confirm if small 'ゃ' is displayed at top of second line

What is the expected behavior?
Line-break should happen between 'キン' and 'ち' (Please refer to safari.png)

What went wrong?
From https://drafts.csswg.org/css-text-3/#line-break-property I think chromium should apply strict for Japanese then 'ゃ' should not come to top of next line so that attached line-break-no-lang.html should be displayed same as line-break-lang-en.html and line-break-lang-ja.html.
From attached line-break-lang-en.html and line-break-lang-ja.html we can see chromium are able to detect strict rule base on typography instead of relying on lang in html element. However, when html missed lang then currently chromium seems could not handle line-break:strict correctly for ja.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 71.0.3578.98 (Official Build) (64-bit)  Channel: stable
OS Version: OS X 10.13
Flash Version:
 

Deleted: safari.png 5.1 KB

	safari.png 5.1 KB View Download

Deleted: line-break-lang-en.html 433 bytes

line-break-lang-en.html 433 bytes View Download

Deleted: line-break-lang-ja.html 433 bytes

line-break-lang-ja.html 433 bytes View Download

Deleted: line-break-no-lang.html 423 bytes

line-break-no-lang.html 423 bytes View Download