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Include troubleshooting section about rounding errors #984

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Include troubleshooting section about rounding errors #984

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07b98a3
Include troubleshooting section about rounding errors
Feb 12, 2019
4517cc7
Perform changes according to feedback from @garris
Jul 1, 2019
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9 changes: 9 additions & 0 deletions README.md
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Expand Up @@ -954,6 +954,15 @@ Sometimes bad permissions happen to good people. It's ok, this is a safe space.

Be sure to use a config `id` in your config file. See https://github.com/garris/BackstopJS/issues/291

### There's no visible difference between "Reference" and "Test" screenshots

You might run into an issue where your reference and test screenshots look seemingly identical but on further inspection have a 1px difference in height or width. To fix this:
1. Open your browser
2. Make sure your viewport is the same as the one you have setup in your configuration
3. Check whether the element you target has a height or width that is not a natural number, i.e. 804.25px. If so, you might have run into a rounding error.
4. Adjust your browser's viewport so the element's width is a natural number will help with this
5. Change the viewport in your configuration

#### If you just upgraded to 2.x or 3.x

Filename formats have changed. To use the 1.x (compatible) file format, use the `fileNameTemplate` property like so...
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