Stack and Card
A model reply starts in a Stack (invisible flex layout — row or column, with a gap) or a Card (a titled box with optional sources). Stack has no chrome of its own; the panels below are Callouts so you can see the arrangement. The source under the card is a link.
Stack
Same three children twice: once in a row, once in a column. Narrow the window and the row wraps. Nothing in the stack is a control.
Card
Click “Example source”. It opens example.com in a new tab. That is the only control on this page.
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