8 blocks in this category, each rendered live below. Open any of them for the full source and a copy button.
A block is one finished section of a page — a pricing table, a hero, a footer.
A scrolling conversation with per-turn actions, announced as a polite log restricted to additions — so a streaming reply is not re-read on every token — and auto-scroll that only pins when the user is already at the bottom.
The trigger menus done properly: @ and / open only at a token boundary, the query is derived from the caret so the menu closes itself, and focus never leaves the textarea — the combobox pattern, not a floating div.
Token-by-token text with linked citations, follow-up chips and a caret that stops the moment the stream does. The status is announced once; the prose is deliberately outside every live region.
The blank thread, answered: grouped starter prompts as real lists of buttons, each group labelled, so the highest-leverage screen in an AI product is not a centred logo.
The answers a regenerate throws away — siblings rather than replacements, an edited question that branches in place, and a plain sentence about what happens to the replies below.
The two-pane assistant layout, with the mismatch nobody else states: the canvas names the version it is showing and says so when that is not the one the conversation is about. Versions link back to the turn that made them.
Model selection with the three numbers the choice actually turns on — capability, latency and cost per message — and locked models explained rather than greyed out.
Files staged against a prompt with a running context-token budget, unreadable files flagged before send, removal allowed mid-upload, and a send button that names its one blocker.