UserAgent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:50.0) Gecko/20100101 Firefox/50.0

Example URL:
http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-htb-in-vlr-001

Steps to reproduce the problem:
8 tests with their associated reference files (expected result):

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-htb-in-vlr-001

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-htb-in-vlr-002

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-htb-in-vrl-001

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-htb-in-vrl-002

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-vlr-in-htb-001

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-vlr-in-htb-002

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-vrl-in-htb-001

http://test.csswg.org/harness/test/css-writing-modes-3_dev/single/sizing-orthog-prct-vrl-in-htb-002

What is the expected behavior?
See their respective reference files

What went wrong?
Some miscalculation by Chrome's CSS engine, imprecise implementation related to section 7.3.1 of Writing-modes spec.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? No 

Does this work in other browsers? Yes

Chrome version: 57.0.2986.0  Channel: dev
OS Version: 
Flash Version: Shockwave Flash 11.2 r202

These 8 tests checks the sizing algorithm when a specific code scenario (orthogonal block, percentage value, containing block of orthogonal block has an indefinite inline size) happens which has been addressed by section 7.3.1 of Writing-modes spec.

"
(...) a percentage of the containing block's inline size cannot be defined, and inline axis computations cannot be resolved. In these cases, the initial containing block's size is used as a fallback variable in place of the available inline space for calculations that require a definite available inline size.
"
7.3.1. Available Space in Orthogonal Flows
https://drafts.csswg.org/css-writing-modes-3/#orthogonal-auto

Firefox 50+ passes these 8 tests.