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Sticky header scrolls out of view when collapsing file sections in a diff/code review viewer. CSS scroll anchoring spec explicitly excludes `position: sticky` elements from being anchor candidates, so the browser cannot automatically keep the sticky file header visible when content below it collapses. Tried CSS-only approaches: grid-template-rows transitions, content-visibility, overflow-anchor — none work because of the sticky exclusion in the spec.

Use native HTML `<details>`/`<summary>` elements for file sections (same approach as GitHub PR diffs). The `<summary>` becomes the sticky file header, the body content sits inside the `<details>`. Key pieces: 1. CSS `scroll-margin-top` on the `<details>` container to account for any fixed/sticky app header above: ```css .file-section { scroll-margin-top: 49px; } ``` 2. Remove default `<summary>` disclosure triangle: ```css summary.file-header { list-style: none; } summary.file-header::-webkit-details-marker { display: none; } ``` 3. Intercept click on `<summary>` BEFORE the native toggle to fix scroll position before content disappears (prevents flicker). Then manually close: ```javascript header.addEventListener('click', function(e) { if (section.open) { e.preventDefault(); if (section.getBoundingClientRect().top < 0) { section.scrollIntoView({ behavior: 'instant' }); } section.open = false; } // Expanding: let native <details> handle it }); ``` The scroll correction happens while content is still visible (no flicker), then `section.open = false` collapses it. For expanding, the native `<details>` behavior works fine without intervention. This is the same pattern used by GitHub (js-details-target) and Gitea (PR #23702). Pure CSS cannot solve this because the scroll anchoring spec excludes sticky elements.

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In Phoenix LiveView, CSS animations on list items (rendered with `:for`) trigger on existing items whenever any unrelated state changes (e.g. toggling a panel). Using `phx-mounted` with `JS.add_class` and `@starting-style` both fail because LiveView's DOM patching (morphdom) touches existing nodes during re-renders, retriggering animations even without true DOM insertion.

Use a `MutationObserver` with `childList: true` on the list container. It fires only when nodes are genuinely inserted or removed — not when morphdom patches attributes or content of existing nodes. Fold it into an existing hook on the container element: ```javascript Hooks.ScrollBottom = { mounted() { this.observer = new MutationObserver((mutations) => { mutations.forEach(mutation => { mutation.addedNodes.forEach(node => { if (node.nodeType === 1 && node.classList.contains("log-entry")) { node.classList.add("log-entry-new") } }) }) this.scrollToBottom() }) this.observer.observe(this.el, { childList: true }) this.scrollToBottom() }, destroyed() { this.observer.disconnect() }, scrollToBottom() { this.el.scrollTop = this.el.scrollHeight } } ``` CSS animation targets only the class added by the observer: ```css .log-entry-new > * { animation: log-entry-in 0.2s ease-out; } @keyframes log-entry-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } } ``` Also add stable `id` attributes to list items (via a shared `append_log` helper that stamps `System.unique_integer([:monotonic, :positive])`) so morphdom matches and patches existing entries in-place rather than recreating them. This is what ensures the MutationObserver sees only genuinely new nodes as `addedNodes`. Why it works: `childList` MutationObserver is O(1) native browser code, fires only on actual insertions, and ignores attribute/text patches that LiveView's morphdom applies to existing nodes.

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Browser autocomplete/autofill suggestions appearing on form inputs despite using autocomplete="off". Tried autocomplete="one-time-code", autocomplete="nope", readonly with onfocus removal, hidden decoy inputs — none reliably suppressed the browser dropdown on Chrome/Safari.

Use `type="search"` instead of `type="text"` and rename the input `name` to something browsers won't recognize as a known autofill category. Browsers treat search inputs differently and don't offer autofill suggestions for them. ```html <input type="search" name="elixir_term" placeholder="value (e.g. 42, :hello, [1,2,3])" autocomplete="off" /> ``` Key insight: browsers key autocomplete suggestions on the `name` attribute. Generic names like `"value"`, `"query"`, `"input"` trigger suggestions from previously submitted form data. Using a domain-specific name that the browser has never seen before prevents matching. Combined with `type="search"`, this reliably suppresses autocomplete on all major browsers. Reference: https://gist.github.com/niksumeiko/360164708c3b326bd1c8

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