UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3111.0 Safari/537.36

Steps to reproduce the problem:
1. Create a CSS grid layout with over 1000 rows. Demo: https://www.scirra.com/labs/grid-1000rows.html
2. Check layout past 1000 rows.

What is the expected behavior?
Layout should proceed normally.

What went wrong?
The layout stops advancing downwards. Later rows are painted on top of the last row, so the visual appearance is garbled.

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 60.0.3111.0  Channel: canary
OS Version: 10.0
Flash Version: 

Current Chrome stable 58.0.3029.110 is also affected. Firefox 53 works correctly.

This affects our PWA at editor.construct.net. We use a CSS grid for layout of user content, and the user can add a lot of rows.