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Highlight trailing whitespace

Marks unnecessary trailing spaces at the end of lines with a red background in file view and diffs.

Code to copy

.blob-code-inner .x-show-bad-trailing-whitespace,
.blob-code-inner .pl-trailing-whitespace,
.blob-trailing-whitespace {
  background: rgba(255,0,0,0.35) !important;
  border-radius: 2px !important;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.