Design system conventions for the Phoenix frontend — layout, dialogs, error display, BEM CSS class naming, and CSS design tokens. Use when building UI, naming CSS classes, creating or consuming tokens, handling errors, or designing dialog interactions in js/app/src/.
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The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this specification are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.
Read the relevant reference(s) based on the task:
| Task | Reference |
|---|---|
| Layout stability, scroll behavior, interaction patterns | references/layout.md |
| Alert and form dialog usage, footer button styling, content writing | references/dialogs.md |
| Error scoping, inline alerts, input validation | references/error-display.md |
| Naming CSS classes | references/bem.md |
| Creating or consuming CSS design tokens | references/tokens.md |
| Picking an icon for a noun (project, trace, span, file, etc.) | references/icons.md |
| Displaying counts in tabs, headings, or filter buttons | references/counters.md |
Choosing or adding an EmptyStateGraphic variant (the per-region/topic empty-state graphics) | references/empty-states.md |
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