Re: [csswg-drafts] [css-text][text-spacing] Visual regressions of line-start at portals and news sites (#9511)

I made a test file to compare trim-auto, space-first, and space-start (= no trimming at line-start) values of the text-spacing-trim property.

HTML: [text-spacing-trim-space-first-test.html](https://gist.githack.com/MurakamiShinyu/ea7fdd45e655f97fb64545c444db9099/raw/text-spacing-trim-space-first-test.html)  
Source (GitHub Gist): https://gist.github.com/MurakamiShinyu/ea7fdd45e655f97fb64545c444db9099

You can test it with Vivliostyle which fully supports text-spacing-trim current spec.

View with Vivliostyle Viewer: https://vivliostyle.org/viewer/#src=https://gist.github.com/MurakamiShinyu/ea7fdd45e655f97fb64545c444db9099

PDF (created with Vivliostyle CLI): [text-spacing-trim-space-first-test.pdf](https://github.com/w3c/csswg-drafts/files/13181374/text-spacing-trim-space-first-test.pdf)


Screenshots:

![text-spacing-trim-space-first-test-p1](https://github.com/w3c/csswg-drafts/assets/3324737/54fe9c85-adfe-46d2-8f1a-1402499323fb)
![text-spacing-trim-space-first-test-p2](https://github.com/w3c/csswg-drafts/assets/3324737/b54a6695-7b0e-44a8-9b49-f29c4d840eda)
![text-spacing-trim-space-first-test-p3](https://github.com/w3c/csswg-drafts/assets/3324737/7a592c8a-55f5-46be-aa89-0d82500c4184)
![text-spacing-trim-space-first-test-p4](https://github.com/w3c/csswg-drafts/assets/3324737/7b9ef804-74c6-418c-a1c4-0cd97a03fa88)
![text-spacing-trim-space-first-test-p5](https://github.com/w3c/csswg-drafts/assets/3324737/796f911b-ec53-4d97-9609-865c50c86815)
![text-spacing-trim-space-first-test-p6](https://github.com/w3c/csswg-drafts/assets/3324737/9082b8cc-147b-4307-9c6a-200961e02187)
![text-spacing-trim-space-first-test-p7](https://github.com/w3c/csswg-drafts/assets/3324737/3b036170-5c5a-425b-b68b-f25ed799f106)


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Received on Thursday, 26 October 2023 18:42:11 UTC