BBC: label data-component blocks
Developer aid: outlines and labels every element carrying a data-component attribute with its name.
Code to copy
// Developer aid: label every [data-component] block
(function () {
document.querySelectorAll('[data-component]').forEach(function (el) {
if (el.dataset.jzLabelled) { return; }
el.dataset.jzLabelled = '1';
el.style.outline = '1px solid rgba(184,0,0,0.4)';
var tag = document.createElement('span');
tag.textContent = el.getAttribute('data-component');
tag.style.cssText = 'background:#b80000;color:#fff;font:10px monospace;' +
'padding:1px 3px;display:inline-block';
el.insertBefore(tag, el.firstChild);
});
})();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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