Wikipedia: collapsible article sections
Lets you click a second-level heading to collapse or expand the whole section of an article.
Code to copy
// Click any H2 heading to collapse or expand its section
function setupCollapse() {
const headings = document.querySelectorAll('.mw-parser-output > .mw-heading2, .mw-parser-output > h2');
headings.forEach(function (h) {
if (h.dataset.jzCollapse) { return; }
h.dataset.jzCollapse = '1';
h.style.cursor = 'pointer';
h.title = 'Click to collapse or expand this section';
h.addEventListener('click', function (e) {
if (e.target.tagName === 'A') { return; }
let el = h.nextElementSibling;
const hidden = h.dataset.jzHidden === '1';
while (el && !/^H2$/.test(el.tagName) && !el.classList.contains('mw-heading2')) {
el.style.display = hidden ? '' : 'none';
el = el.nextElementSibling;
}
h.dataset.jzHidden = hidden ? '0' : '1';
h.style.opacity = hidden ? '1' : '0.6';
});
});
}
setupCollapse();
new MutationObserver(setupCollapse).observe(document.body, { childList: true, subtree: true });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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