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X: outline data-testid elements

A style-author aid that outlines every element carrying a data-testid attribute to help write selectors.

Code to copy

/* Developer aid: outline every element that carries a data-testid */
[data-testid] {
  outline: 1px solid rgba(29, 155, 240, 0.4) !important;
}
[data-testid]:hover {
  outline: 2px solid rgba(29, 155, 240, 0.9) !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.