UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0

Example URL:
https://test.csswg.org/harness/test/css-fonts-3_dev/single/font-variant-05/format/html5/

Steps to reproduce the problem:
1. https://test.csswg.org/harness/test/css-fonts-3_dev/single/font-variant-05/format/html5/
2. 
3. 

What is the expected behavior?
All characters on all lines should display as check marks. This test is using a special font to check which OpenType features are enabled or disabled.

What went wrong?
The first three lines have two crosses.

Setting ‘font-variant-ligatures’ properties will override the same properties set in the
@font-face rule. But properties set there and not explicitly turned off or on later remain set.

Tests interaction of font-variant descriptor, font-variant-ligatures property, font-variant shorthand property & font-feature-settings low-level property for ligatures, in accordance with  steps 1,2,4 and 6 of section 7.2 Feature precedence
https://www.w3.org/TR/css-fonts-3/#feature-precedence

Does it occur on multiple sites: Yes

Is it a problem with a plugin? N/A 

Did this work before? No 

Does this work in other browsers? No
 Firefox

Chrome version: 67.0.3377.0 (Official Build) canary (64-bit) (cohort: Clang-64)  Channel: n/a
OS Version: 10.0
Flash Version: