Trello: reveal data-testid attributes
Outlines elements that carry a data-testid and prints its value, helping you write selectors.
Code to copy
// Outline every element that has a data-testid and label it
(function () {
const ID = 'jz-trl-testids';
const old = document.getElementById(ID);
if (old) { old.remove(); return; }
const st = document.createElement('style');
st.id = ID;
st.textContent =
'[data-testid]{outline:1px dashed rgba(255,0,128,.6)!important}' +
'[data-testid]::before{content:attr(data-testid);position:absolute;' +
'font:10px/1 monospace;background:#d6336c;color:#fff;padding:1px 3px;z-index:9999}';
document.head.appendChild(st);
})();How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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