feat(html): add aria-atomic helper

Co-Authored-By: Virgil <virgil@lethean.io>

docs/architecture.md

@@ -44,6 +44,7 @@ Accessibility-oriented helpers are also provided for common attribute patterns:
 - `AriaCurrent(node, current)`
 - `AriaBusy(node, busy)`
 - `AriaLive(node, live)`
+- `AriaAtomic(node, atomic)`
 - `AriaDescription(node, description)`
 - `AriaDetails(node, ids...)`
 - `AriaErrorMessage(node, ids...)`

docs/index.md

@@ -39,7 +39,7 @@ This builds a Header-Content-Footer layout with semantic HTML elements (`<header
 
 | Path | Purpose |
 |------|---------|
-| `node.go` | `Node` interface and all node types: `El`, `Text`, `Raw`, `If`, `Unless`, `Each`, `EachSeq`, `Switch`, `Entitled`, plus `AriaLabel`, `AriaControls`, `AriaHasPopup`, `AriaOwns`, `AriaKeyShortcuts`, `Alt`/`AltText`, `AriaBusy`, `AriaLive`, `AriaDescription`, `AriaDetails`, `AriaErrorMessage`, `AriaRoleDescription`, `AriaDisabled`, `AriaModal`, `AriaChecked`, `AriaInvalid`, `AriaRequired`, `AriaPressed`, `AriaSelected`, `Hidden`, `TabIndex`, and `AutoFocus` helpers |
+| `node.go` | `Node` interface and all node types: `El`, `Text`, `Raw`, `If`, `Unless`, `Each`, `EachSeq`, `Switch`, `Entitled`, plus `AriaLabel`, `AriaControls`, `AriaHasPopup`, `AriaOwns`, `AriaKeyShortcuts`, `Alt`/`AltText`, `AriaBusy`, `AriaLive`, `AriaAtomic`, `AriaDescription`, `AriaDetails`, `AriaErrorMessage`, `AriaRoleDescription`, `AriaDisabled`, `AriaModal`, `AriaChecked`, `AriaInvalid`, `AriaRequired`, `AriaPressed`, `AriaSelected`, `Hidden`, `TabIndex`, and `AutoFocus` helpers |
 | `layout.go` | HLCRF compositor with semantic HTML elements and ARIA roles |
 | `responsive.go` | Multi-variant breakpoint wrapper (`data-variant` containers, CSS scoping helpers) |
 | `context.go` | Rendering context: identity, locale, entitlements, i18n service |
@@ -52,7 +52,7 @@ This builds a Header-Content-Footer layout with semantic HTML elements (`<header
 
 ## Key Concepts
 
-**Node tree** -- All renderable units implement `Node`, a single-method interface: `Render(ctx *Context) string`. The library composes nodes into trees using `El()` for elements, `Text()` for translated text, and control-flow constructors (`If`, `Unless`, `Each`, `Switch`, `Entitled`), plus accessibility and visibility helpers such as `AriaLabel()`, `AriaControls()`, `AriaHasPopup()`, `AriaOwns()`, `AriaKeyShortcuts()`, `AriaCurrent()`, `AriaBusy()`, `AriaLive()`, `AriaDescription()`, `AriaDetails()`, `AriaErrorMessage()`, `AriaRoleDescription()`, `AriaHidden()`, `Hidden()`, `AriaDisabled()`, `AriaModal()`, `AriaChecked()`, `AriaInvalid()`, `AriaRequired()`, `AriaReadOnly()`, and `TabIndex()`.
+**Node tree** -- All renderable units implement `Node`, a single-method interface: `Render(ctx *Context) string`. The library composes nodes into trees using `El()` for elements, `Text()` for translated text, and control-flow constructors (`If`, `Unless`, `Each`, `Switch`, `Entitled`), plus accessibility and visibility helpers such as `AriaLabel()`, `AriaControls()`, `AriaHasPopup()`, `AriaOwns()`, `AriaKeyShortcuts()`, `AriaCurrent()`, `AriaBusy()`, `AriaLive()`, `AriaAtomic()`, `AriaDescription()`, `AriaDetails()`, `AriaErrorMessage()`, `AriaRoleDescription()`, `AriaHidden()`, `Hidden()`, `AriaDisabled()`, `AriaModal()`, `AriaChecked()`, `AriaInvalid()`, `AriaRequired()`, `AriaReadOnly()`, and `TabIndex()`.
 
 **HLCRF Layout** -- A five-slot compositor that maps to semantic HTML: `<header>` (H), `<aside>` (L/R), `<main>` (C), `<footer>` (F). The variant string controls which slots render: `"HLCRF"` for all five, `"HCF"` for three, `"C"` for content only. Layouts nest: placing a `Layout` inside another layout's slot produces hierarchical `data-block` paths like `L-0-C-0`.
 

node.go

@@ -289,6 +289,15 @@ func AriaLive(n Node, live string) Node {
 	return n
 }
 
+// node.go: AriaAtomic sets the aria-atomic attribute on a live region node.
+// Example: AriaAtomic(El("div"), true).
+func AriaAtomic(n Node, atomic bool) Node {
+	if atomic {
+		return Attr(n, "aria-atomic", "true")
+	}
+	return Attr(n, "aria-atomic", "false")
+}
+
 // node.go: AriaDescription sets the aria-description attribute on an element node.
 // Example: AriaDescription(El("button"), "Opens the navigation menu").
 // An empty value leaves the node unchanged so callers can opt out cleanly.

node_test.go

@@ -467,6 +467,26 @@ func TestAriaLiveHelper_IgnoresWhitespace(t *testing.T) {
 	}
 }
 
+func TestAriaAtomicHelper(t *testing.T) {
+	ctx := NewContext()
+	node := AriaAtomic(El("div", Raw("updates")), true)
+	got := node.Render(ctx)
+	want := `<div aria-atomic="true">updates</div>`
+	if got != want {
+		t.Errorf("AriaAtomic(true) = %q, want %q", got, want)
+	}
+}
+
+func TestAriaAtomicHelper_False(t *testing.T) {
+	ctx := NewContext()
+	node := AriaAtomic(El("div", Raw("updates")), false)
+	got := node.Render(ctx)
+	want := `<div aria-atomic="false">updates</div>`
+	if got != want {
+		t.Errorf("AriaAtomic(false) = %q, want %q", got, want)
+	}
+}
+
 func TestAriaDescriptionHelper(t *testing.T) {
 	ctx := NewContext()