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Show data-testid attributes

Appends a small label with the value next to every element that has a data-testid attribute, handy for E2E tests.

Code to copy

[data-testid]::after {
  content: "testid=" attr(data-testid);
  display: inline-block;
  background: #504945; color: #fbf1c7;
  font: 10px monospace; padding: 1px 4px;
  margin-left: 4px; border-radius: 3px;
  vertical-align: middle;
}

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.