User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36 Steps to reproduce: 1. Open the Firefox Nightly Browser 2. Open Codepen: https://codepen.io/maurroj/pen/wmyMQx 3. Open Firefox Dev Tools Actual results: 1. Bad positioning of GRID Items 2. Warning: 'grid' invalid property value. Expected results: Good positioning of GRID Items without warnings. Please see attachment file.

I could reproduce Grid issue on the latest nightly on windows 10. I don't get any warning message though.

(In reply to Kanchan Kumari QA from comment #1) > I could reproduce Grid issue on the latest nightly on windows 10. I don't > get any warning message though. Hi Kanchan Kumari, Thank you so much for your answer! It's very weird because Today, I have updated my Firefox Nightly 61.0a1 (2018-04-02) and I tried again but Unfortunately, the problem and warning continue. I share my last screenshoot (firefox_nighly_grid_problem.png), please, Can you help with this problem? I'd be really grateful.

I have updated my Firefox Nightly 61.0a1 (2018-04-02) and I tried again but Unfortunately, the problem and warning continue. I share my last screenshoot, please, Can you help with this problem. I'd be really grateful.

So this is because Gecko only supports one grid-auto-rows / grid-auto-columns value value. Mats, is there a bug adding support for multiple of those?

That is, the `grid-auto-rows` property should accept `<track-size>+`, not just `<track-size>`. That is, this comment[1] needs to be addressed. [1]: https://searchfox.org/mozilla-central/rev/f860c2bf00576959b07e2d9619c7b5088b0005be/servo/components/style/properties/longhand/position.mako.rs#307