Looks like Gecko and Blink both treat zero as invalid, so going ahead and speccing that. [Testcase](http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E%0A%3Cstyle%3E%0Abody%20%7B%20display%3A%20grid%3B%20grid-template-columns%3A%20100px%20repeat(0%2C%20100px)%3B%20%7D%0A%3C%2Fstyle%3E%0A%3Cp%20style%3D%22background%3A%20green%22%3Ex%3C%2Fp%3E) -- GitHub Notification of comment by fantasai Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/4479#issuecomment-548952782 using your GitHub accountReceived on Friday, 1 November 2019 21:12:58 UTC
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