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8 changes: 4 additions & 4 deletions docs/md/development.md
Original file line number Diff line number Diff line change
Expand Up @@ -211,10 +211,10 @@ installed in a Docker container.
The Puppeteer/UI tests are a form of
[characterization tests](https://en.wikipedia.org/wiki/Characterization_test)
which use screenshots to compare current and previous behavior of
`<perspective-viewer>` and its plugins. The results of the each comparison are
`<perspective-viewer>` and its plugins. The results of each comparison are
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Removed spaces.

stored in each package's `test/results/results.json` file, and the screenshots
themselves are stroed in the package's `screenshots/` directory, though only the
former should be checked in to GIT. When a test in these suites fails, a
themselves are stored in the package's `screenshots/` directory, though only the
former should be checked into GIT. When a test in these suites fails, a
`file.failed.png` and `file.diff.png` are also generated, showing the divergent
screenshot and a contrast diff respectively, so you can verify that the changed
behavior either does or does not reflect your patch. If you're confident that
Expand Down Expand Up @@ -282,7 +282,7 @@ that the benchmark suite will run, where `<NUMBER>` is an integer greater
than 0. If `<NUMBER>` cannot be parsed, is 0, or is greater than the number of
versions, the benchmark suite will run all previous versions of Perspective.

The benchmarks report and `results.json` show a historgram of current
The benchmarks report and `results.json` show a histogram of current
performance, as well as that of the previous `results.json`. Running this should
probably be standard practice after making a large change which may affect
performance, but please create a baseline `results.json` entry for your test
Expand Down