cv-combobox

Combobox input with popup listbox, supporting editable and select-only modes, single and multi-select, clearable behavior, and grouped options.

Headless: createCombobox

Cross-Spec Consistency

This document is the UIKit surface contract for Combobox.

Headless createCombobox is the source of truth for state, transitions, and invariants.
UIKit mirrors headless contracts through DOM attributes and events.
Any intentional divergence between UIKit and headless MUST be documented in both specs.

Usage

View source

html

<div class="combobox-demo-shell" data-demo="combobox" data-live-demo-height="1180">
  <section class="combobox-demo-hero" aria-labelledby="combobox-demo-title">
    <div class="combobox-demo-copy">
      <span class="combobox-demo-kicker">Search and select primitive</span>
      <h3 id="combobox-demo-title">
        Use combobox when a controlled choice also needs filtering, grouping, or tags.
      </h3>
      <p>
        The headless model owns input value, active option, popup state, selection, and ARIA contracts. UIKit
        renders the editable field, select-only trigger, clear control, grouped listbox, and selected tag
        surface.
      </p>
    </div>

    <dl class="combobox-demo-metrics" aria-label="Combobox contract summary">
      <div>
        <dt>Modes</dt>
        <dd>editable / select-only</dd>
      </div>
      <div>
        <dt>Selection</dt>
        <dd>single / multiple / grouped</dd>
      </div>
      <div>
        <dt>Events</dt>
        <dd>input / change / clear</dd>
      </div>
    </dl>
  </section>

  <section class="combobox-demo-board" aria-label="Combobox examples in a vault routing form">
    <form class="combobox-demo-panel" data-combobox-form>
      <div class="combobox-demo-panel-head">
        <div>
          <span>Visible profile routing</span>
          <strong>relay.surface / browser tags / operator handoff</strong>
        </div>
        <cv-badge variant="primary" pill>live contract</cv-badge>
      </div>

      <div class="combobox-demo-field-grid">
        <cv-field required>
          <span slot="label">Visible route</span>
          <cv-combobox
            data-combobox-primary
            clearable
            value="relay"
            input-value="Relay endpoint"
            placeholder="Search routes"
            aria-label="Visible route"
          >
            <span slot="prefix" aria-hidden="true">route</span>
            <cv-combobox-option value="relay">Relay endpoint</cv-combobox-option>
            <cv-combobox-option value="gateway">Gateway unlock</cv-combobox-option>
            <cv-combobox-option value="import">Credential import</cv-combobox-option>
            <cv-combobox-option value="archive" disabled>Archive export disabled</cv-combobox-option>
          </cv-combobox>
          <span slot="description"
            >Editable mode filters options while keeping the committed selection explicit.</span
          >
        </cv-field>

        <cv-field>
          <span slot="label">Layer tags</span>
          <cv-combobox
            multiple
            clearable
            max-tags-visible="2"
            value="browser otp recovery"
            placeholder="Add tags"
            aria-label="Layer tags"
          >
            <cv-combobox-option value="browser">Browser</cv-combobox-option>
            <cv-combobox-option value="otp">OTP</cv-combobox-option>
            <cv-combobox-option value="recovery">Recovery</cv-combobox-option>
            <cv-combobox-option value="shared">Shared vault</cv-combobox-option>
          </cv-combobox>
          <span slot="description">Multiple selection renders tags and keeps the popup open by default.</span>
        </cv-field>

        <cv-field>
          <span slot="label">Operator</span>
          <cv-combobox type="select-only" value="alex" placeholder="Assign operator" aria-label="Operator">
            <cv-combobox-option value="alex">Alex - security review</cv-combobox-option>
            <cv-combobox-option value="maria">Maria - legal hold</cv-combobox-option>
            <cv-combobox-option value="ops">Ops queue</cv-combobox-option>
          </cv-combobox>
          <span slot="description"
            >Select-only mode follows the combobox trigger pattern without text filtering.</span
          >
        </cv-field>

        <cv-field>
          <span slot="label">Jurisdiction</span>
          <cv-combobox placeholder="Filter jurisdiction" aria-label="Jurisdiction">
            <cv-combobox-group label="Low-friction review">
              <cv-combobox-option value="helsinki">Helsinki</cv-combobox-option>
              <cv-combobox-option value="reykjavik">Reykjavik</cv-combobox-option>
            </cv-combobox-group>
            <cv-combobox-group label="Manual approval">
              <cv-combobox-option value="border">Border crossing</cv-combobox-option>
              <cv-combobox-option value="seizure">Device seizure</cv-combobox-option>
            </cv-combobox-group>
          </cv-combobox>
          <span slot="description"
            >Groups keep navigation flat while preserving labeled listbox structure.</span
          >
        </cv-field>
      </div>
    </form>

    <aside class="combobox-demo-side" aria-label="Combobox event output">
      <div class="combobox-demo-side-head">
        <span class="combobox-demo-kicker">Event stream</span>
        <h4>Interact with any combobox to inspect the public state emitted by the component.</h4>
      </div>

      <p class="combobox-demo-log" role="status" aria-live="polite" data-combobox-output>
        Waiting for interaction. Type, pick an option, toggle a tag, or clear a value.
      </p>

      <dl class="combobox-demo-live" aria-label="Live combobox state">
        <div>
          <dt>Selection</dt>
          <dd data-combobox-selected>relay</dd>
        </div>
        <div>
          <dt>Input</dt>
          <dd data-combobox-input>Relay endpoint</dd>
        </div>
        <div>
          <dt>Popup</dt>
          <dd data-combobox-open>closed</dd>
        </div>
      </dl>

      <div class="combobox-demo-open-card">
        <span>Open grouped listbox</span>
        <cv-combobox
          open
          type="select-only"
          value="work"
          placeholder="Select vault"
          aria-label="Open vault selector"
        >
          <cv-combobox-group label="Vaults">
            <cv-combobox-option value="personal">Personal vault</cv-combobox-option>
            <cv-combobox-option value="work">Work vault</cv-combobox-option>
            <cv-combobox-option value="decoy">Visible decoy vault</cv-combobox-option>
          </cv-combobox-group>
        </cv-combobox>
      </div>
    </aside>
  </section>

  <section class="combobox-demo-section" aria-labelledby="combobox-demo-matrix-title">
    <div class="combobox-demo-section-header">
      <span class="combobox-demo-kicker">State matrix</span>
      <h4 id="combobox-demo-matrix-title">
        One component covers typed filtering, trigger-only selection, tag overflow, invalid input, grouping,
        and sizing.
      </h4>
    </div>

    <div class="combobox-demo-matrix" aria-label="Combobox state matrix">
      <div>
        <span>Editable filter</span>
        <cv-combobox input-value="gate" placeholder="Type to filter" aria-label="Editable filter">
          <cv-combobox-option value="gateway">Gateway</cv-combobox-option>
          <cv-combobox-option value="gatekeeper">Gatekeeper</cv-combobox-option>
          <cv-combobox-option value="relay">Relay</cv-combobox-option>
        </cv-combobox>
      </div>

      <div>
        <span>Select-only</span>
        <cv-combobox type="select-only" value="hardware" placeholder="Choose boundary" aria-label="Boundary">
          <cv-combobox-option value="software">Software only</cv-combobox-option>
          <cv-combobox-option value="hardware">Hardware-assisted</cv-combobox-option>
        </cv-combobox>
      </div>

      <div>
        <span>Tag overflow</span>
        <cv-combobox
          multiple
          clearable
          max-tags-visible="1"
          value="legal source hardware"
          placeholder="Tags"
          aria-label="Tag overflow"
        >
          <cv-combobox-option value="legal">Legal</cv-combobox-option>
          <cv-combobox-option value="source">Source</cv-combobox-option>
          <cv-combobox-option value="hardware">Hardware</cv-combobox-option>
        </cv-combobox>
      </div>

      <div>
        <span>Invalid</span>
        <cv-field invalid>
          <span slot="label">Policy route</span>
          <cv-combobox
            invalid
            input-value="unknown relay"
            placeholder="Search route"
            aria-label="Invalid route"
          >
            <cv-combobox-option value="relay">Relay endpoint</cv-combobox-option>
          </cv-combobox>
          <span slot="error">Route is not available in this visible profile.</span>
        </cv-field>
      </div>

      <div>
        <span>Disabled option</span>
        <cv-combobox value="active" placeholder="Choose state" aria-label="Disabled option">
          <cv-combobox-option value="active">Active</cv-combobox-option>
          <cv-combobox-option value="archived" disabled>Archived policy</cv-combobox-option>
        </cv-combobox>
      </div>

      <div>
        <span>Sizes</span>
        <cv-combobox size="small" value="s" placeholder="Small" aria-label="Small combobox">
          <cv-combobox-option value="s">Small</cv-combobox-option>
          <cv-combobox-option value="m">Medium</cv-combobox-option>
        </cv-combobox>
        <cv-combobox size="large" value="l" placeholder="Large" aria-label="Large combobox">
          <cv-combobox-option value="m">Medium</cv-combobox-option>
          <cv-combobox-option value="l">Large</cv-combobox-option>
        </cv-combobox>
      </div>
    </div>
  </section>
</div>

<script type="module">
  document
    .querySelectorAll('.combobox-demo-shell[data-demo="combobox"]:not([data-ready])')
    .forEach((shell) => {
      shell.dataset.ready = 'true'

      const form = shell.querySelector('[data-combobox-form]')
      const output = shell.querySelector('[data-combobox-output]')
      const selected = shell.querySelector('[data-combobox-selected]')
      const input = shell.querySelector('[data-combobox-input]')
      const popup = shell.querySelector('[data-combobox-open]')

      const eventLabels = {
        'cv-input': 'input',
        'cv-change': 'change',
        'cv-clear': 'clear',
      }

      const getFieldName = (combobox) => {
        const label = combobox.closest('cv-field')?.querySelector('[slot="label"]')?.textContent?.trim()
        return label || combobox.getAttribute('aria-label') || 'combobox'
      }

      const readState = (combobox, detail = {}) => {
        const selectedIds = Array.isArray(detail.selectedIds) ? detail.selectedIds : []
        const value = typeof detail.value === 'string' ? detail.value : combobox.value || ''
        const inputValue =
          typeof detail.inputValue === 'string' ? detail.inputValue : combobox.inputValue || ''
        const open = typeof detail.open === 'boolean' ? detail.open : combobox.open

        return {
          selection: selectedIds.length > 0 ? selectedIds.join(', ') : value || 'none',
          inputValue: inputValue || 'empty',
          popup: open ? 'open' : 'closed',
        }
      }

      const updateState = (combobox, detail = {}) => {
        const state = readState(combobox, detail)

        if (selected) selected.textContent = state.selection
        if (input) input.textContent = state.inputValue
        if (popup) popup.textContent = state.popup

        shell.dataset.comboboxState =
          state.popup === 'open' ? 'open' : state.selection === 'none' ? 'idle' : 'selected'
        return state
      }

      const report = (event) => {
        const combobox = event.target instanceof HTMLElement ? event.target : null
        if (!combobox?.matches('cv-combobox')) return

        const state = updateState(combobox, event.detail)
        const name = getFieldName(combobox)
        const label = eventLabels[event.type] ?? event.type

        if (output) {
          output.textContent = `${label}: ${name} -> ${state.selection}; input ${state.inputValue}; popup ${state.popup}`
        }
      }

      form?.addEventListener('submit', (event) => {
        event.preventDefault()
        if (output) output.textContent = 'submit: form boundary reached without changing combobox state.'
      })

      Object.keys(eventLabels).forEach((eventName) => {
        shell.addEventListener(eventName, report)
      })
    })
</script>

Anatomy

Editable mode (default)

<cv-combobox> (host)
└── <div part="base">
    ├── <div part="input-wrapper">
    │   ├── <div part="tags">                    ← only when [multiple], contains selected tags
    │   │   ├── <span part="tag">                ← one per selected item (up to max-tags-visible)
    │   │   │   ├── <span part="tag-label">
    │   │   │   └── <button part="tag-remove">
    │   │   └── <span part="tag-overflow">       ← "+N more" when overflow
    │   ├── <input part="input" role="combobox">
    │   ├── <button part="clear-button">         ← only when [clearable] and value is present
    │   └── <span part="expand-icon">
    └── <div part="listbox" role="listbox">
        ├── <div part="group" role="group">      ← one per cv-combobox-group
        │   ├── <div part="group-label" role="presentation">
        │   └── <slot>                           ← accepts <cv-combobox-option> within group
        └── <slot>                               ← accepts <cv-combobox-option> (ungrouped)

Select-only mode

<cv-combobox type="select-only"> (host)
└── <div part="base">
    ├── <div part="input-wrapper">
    │   ├── <div part="tags">                    ← only when [multiple]
    │   │   └── (same tag structure as editable)
    │   ├── <div part="trigger" role="combobox"> ← replaces <input> in select-only
    │   │   └── <span part="label">             ← selected value text or placeholder
    │   ├── <button part="clear-button">         ← only when [clearable] and value is present
    │   └── <span part="expand-icon">
    └── <div part="listbox" role="listbox">
        └── (same listbox structure as editable)

Attributes

Attribute	Type	Default	Description
`value`	String	`""`	Selected option id. In multi mode, space-delimited string of selected option values.
`input-value`	String	`""`	Editable input text. Read-only in select-only mode.
`open`	Boolean	`false`	Popup open state
`type`	String	`"editable"`	Combobox mode: `"editable"` \| `"select-only"`
`multiple`	Boolean	`false`	Enables multi-select behavior
`clearable`	Boolean	`false`	Shows clear button when a value is selected
`max-tags-visible`	Number	`3`	Maximum tags shown before "+N more" overflow. `0` = unlimited. Only meaningful when `multiple` is `true`.
`open-on-focus`	Boolean	`true`	Opens popup when input receives focus
`open-on-click`	Boolean	`true`	Opens popup on input/trigger click when closed
`close-on-select`	Boolean	`true` (single) / `false` (multi)	Closes popup after selection commit. Default depends on `multiple`.
`match-mode`	String	`"includes"`	Default filter mode: `includes` \| `startsWith`. Ignored in select-only mode.
`placeholder`	String	`""`	Placeholder text for input or trigger
`disabled`	Boolean	`false`	Prevents interaction
`size`	String	`"medium"`	Size: `small` \| `medium` \| `large`
`aria-label`	String	`""`	Accessible label for input/listbox

Sizes

Size	`--cv-combobox-min-height`	`--cv-combobox-padding-inline`
`small`	`30px`	`var(--cv-space-2, 8px)`
`medium`	`36px`	`var(--cv-space-3, 12px)`
`large`	`42px`	`var(--cv-space-4, 16px)`

Slots

Slot	Description
`(default)`	One or more `<cv-combobox-option>` or `<cv-combobox-group>` children
`prefix`	Icon or element before the input/trigger
`suffix`	Icon or element after the input/trigger (before expand icon)

CSS Parts

Part	Element	Description
`base`	`<div>`	Root layout container
`input-wrapper`	`<div>`	Wrapper around input/trigger, tags, clear button, and expand icon
`cv-input`	`<input>`	Editable combobox control (editable mode only)
`trigger`	`<div>`	Button-like trigger control (select-only mode only)
`label`	`<span>`	Selected value text inside trigger (select-only mode)
`listbox`	`<div>`	Popup listbox container
`tags`	`<div>`	Container for selected item tags (multi-select only)
`tag`	`<span>`	Individual selected item tag (multi-select only)
`tag-label`	`<span>`	Text label inside a tag
`tag-remove`	`<button>`	Remove button inside a tag
`tag-overflow`	`<span>`	"+N more" overflow indicator
`clear-button`	`<button>`	Clear selection button (clearable mode only)
`expand-icon`	`<span>`	Dropdown expand/collapse indicator icon
`group`	`<div>`	Option group container inside the listbox
`group-label`	`<div>`	Group header label inside the listbox
`prefix`	`<span>`	Wrapper around the `prefix` slot
`suffix`	`<span>`	Wrapper around the `suffix` slot

CSS Custom Properties

Property	Default	Description
`--cv-combobox-min-width`	`260px`	Minimum inline size of the host
`--cv-combobox-min-height`	`36px`	Minimum block size of the input/trigger
`--cv-combobox-padding-inline`	`var(--cv-space-3, 12px)`	Horizontal padding of the input/trigger
`--cv-combobox-max-height`	`220px`	Maximum block size of the listbox popup
`--cv-combobox-border-color`	`var(--cv-color-border, #2a3245)`	Border color for input/trigger and listbox
`--cv-combobox-border-radius`	`var(--cv-radius-sm, 6px)`	Border radius of the input/trigger
`--cv-combobox-listbox-radius`	`var(--cv-radius-md, 10px)`	Border radius of the listbox popup
`--cv-combobox-gap`	`var(--cv-space-1, 4px)`	Gap between base layout sections
`--cv-combobox-tag-gap`	`var(--cv-space-1, 4px)`	Gap between tags in multi-select
`--cv-combobox-tag-radius`	`var(--cv-radius-sm, 6px)`	Border radius of tag chips
`--cv-combobox-font-size`	`inherit`	Font size of the input/trigger text

Visual States

Host selector	Description
`:host([disabled])`	Reduced opacity (`0.55`), `cursor: not-allowed`
`:host([open])`	Popup listbox is visible
`:host([type="select-only"])`	Trigger is a button-like element instead of an input
`:host([multiple])`	Multi-select mode with tag chips
`:host([clearable])`	Clear button may be shown
`:host([size="small"])`	Small size overrides
`:host([size="large"])`	Large size overrides

ARIA Contract

Editable mode

Input role is combobox
Input exposes aria-haspopup="listbox", aria-expanded, aria-controls, aria-autocomplete="list"
When popup is open and active option exists, input exposes aria-activedescendant

Select-only mode

Trigger role is combobox
Trigger exposes aria-haspopup="listbox", aria-expanded, aria-controls
aria-autocomplete is not present (no text input)
When popup is open and active option exists, trigger exposes aria-activedescendant

Common

Popup role is listbox
Options use role option
When multiple=true, listbox exposes aria-multiselectable="true"
Each selected option exposes aria-selected="true" (all selected in multi mode, not just one)
Option groups use role="group" with aria-labelledby pointing to the group label element
Group label elements use role="presentation"

All ARIA attributes are derived from headless contracts (getInputProps, getListboxProps, getOptionProps, getGroupProps, getGroupLabelProps). UIKit does not compute ARIA state independently.

Events

Event	Detail	Description
`cv-input`	`{value: string \| null, inputValue: string, activeId: string \| null, open: boolean, selectedIds: string[]}`	Fires when combobox interaction changes observable state
`cv-change`	`{value: string \| null, inputValue: string, activeId: string \| null, open: boolean, selectedIds: string[]}`	Fires when selected option(s) change
`cv-clear`	`{}`	Fires when the clear button is clicked

In multi mode, cv-input fires on each toggle and cv-change fires on each toggle (since every toggle changes selection). The selectedIds array in the detail reflects all currently selected option ids.

Reactive State Mapping

cv-combobox is a visual adapter over headless createCombobox reactive state.

Attribute to Headless (UIKit -> Headless)

UIKit Property	Direction	Headless Binding
`value`	attr -> action	`actions.select(id)` / `actions.clearSelection()`. In multi mode, parsed as space-delimited ids.
`input-value`	attr -> action	`actions.setInputValue(value)`
`open`	attr -> action	`actions.open()` / `actions.close()`
`type`	attr -> option	passed as `type` in `createCombobox(options)`
`multiple`	attr -> option	passed as `multiple` in `createCombobox(options)`
`clearable`	attr -> option	passed as `clearable` in `createCombobox(options)`
`close-on-select`	attr -> option	passed as `closeOnSelect` in `createCombobox(options)`
`match-mode`	attr -> option	passed as `matchMode` in `createCombobox(options)`
`aria-label`	attr -> option	passed as `ariaLabel` in `createCombobox(options)`

Headless to DOM (Headless -> UIKit)

Headless State	Direction	DOM Reflection
`state.selectedId()`	state -> attr	`[value]` host attribute (single mode)
`state.selectedIds()`	state -> attr	`[value]` host attribute as space-delimited string (multi mode)
`state.inputValue()`	state -> attr	`[input-value]` host attribute
`state.isOpen()`	state -> attr	`[open]` host attribute
`state.activeId()`	state -> render	`aria-activedescendant` on input/trigger
`state.hasSelection()`	state -> render	clear button visibility
`state.type()`	state -> render	determines input vs trigger rendering
`state.multiple()`	state -> render	determines tag rendering

Contract Spreading

contracts.getInputProps() is spread onto [part="input"] (editable) or [part="trigger"] (select-only) -- applies role, aria-haspopup, aria-expanded, aria-controls, aria-autocomplete (editable only), aria-activedescendant, aria-label
contracts.getListboxProps() is spread onto [part="listbox"] -- applies role, tabindex, aria-label, aria-multiselectable (multi only)
contracts.getOptionProps(id) is spread onto each cv-combobox-option -- applies role, tabindex, aria-selected, aria-disabled, data-active
contracts.getGroupProps(groupId) is spread onto each [part="group"] -- applies role, aria-labelledby
contracts.getGroupLabelProps(groupId) is spread onto each [part="group-label"] -- applies id, role
contracts.getVisibleOptions() drives option/group visibility (supports grouped structure; empty groups are hidden)
contracts.getFlatVisibleOptions() available for navigation index calculations

UIKit-Only Concerns (NOT in headless)

Tag/chip rendering for multi-select selected items
"+N more" overflow display for multi-select (controlled by max-tags-visible)
Clear button rendering and visibility (uses state.hasSelection() + clearable attribute)
Select-only trigger visual (button-like with selected label + expand icon)
Option group visual styling (indentation, group header)
Popup positioning and animation
cv-clear event dispatch
Size variants (small / medium / large)

Behavioral Contract

Editable Mode (default)

Text input updates input-value, opens popup, and filters visible options
Focus opens popup only when open-on-focus=true
Input click opens popup only when open-on-click=true
Arrow/Home/End navigation follows headless combobox behavior
Enter commits active option (value, input-value, popup closes only when close-on-select=true)
Escape closes popup without clearing committed selection
Clicking outside closes popup
match-mode="startsWith" uses case-insensitive starts-with filtering
Slot changes rebuild model while preserving still-valid selected value

Select-Only Mode

input-value is not user-editable; setInputValue is a no-op in headless
Trigger displays the selected option's label (or placeholder when no selection)
Keyboard when closed: Space/Enter opens popup; ArrowDown/ArrowUp opens and activates first/last option
Keyboard when open: ArrowDown/ArrowUp navigate; Enter/Space commit active option; Escape closes; Home/End navigate to first/last
Type-to-select via printable characters: typeahead jumps to matching option by label prefix
Filtering is disabled; all non-disabled options are always visible

Multi-Select

commitActive toggles the active option in selectedIds instead of replacing selection
select(id) toggles the option instead of replacing
Listbox stays open after each selection (default close-on-select=false)
input-value is NOT overwritten on commit (it drives filtering in editable multi mode)
In select-only multi mode, inputValue is always "" (trigger shows tags instead)
Tags/chips are rendered inside [part="tags"] for each selected item
When selectedIds.length > max-tags-visible, overflow shows "+N more" in [part="tag-overflow"]
Clicking [part="tag-remove"] calls actions.removeSelected(id)
value attribute reflects all selected ids as a space-delimited string

Clearable

Clear button [part="clear-button"] is visible when clearable=true and state.hasSelection() is true
Clicking the clear button calls actions.clear() (resets both selection and input value)
cv-clear event is dispatched when the clear button is clicked

Option Groups

<cv-combobox-group label="Name"> wraps <cv-combobox-option> children into a visual group
Groups are rendered as [part="group"] with role="group" and aria-labelledby pointing to [part="group-label"]
Groups with all options filtered out are hidden
Navigation crosses group boundaries seamlessly (headless handles this via flat visible options)

Disabled State

When disabled=true, the combobox is non-interactive: input/trigger cannot be focused, popup cannot open, clear/tag-remove buttons are inert

Optional Advanced Behaviors (Future Scope)

These behaviors are optional and currently not required on cv-combobox:

free-text/custom value commit when no option is active
async option loading
inline autocomplete completion rendering

Child Elements

cv-combobox-option

Individual option within a combobox. The parent cv-combobox manages all ARIA attributes on this element via headless contracts.

Anatomy

<cv-combobox-option> (host)
└── <div part="base">
    └── <slot>

Attributes

Attribute	Type	Default	Description
`value`	String	`""`	Unique identifier for this option. Auto-generated as `option-{n}` if omitted.
`disabled`	Boolean	`false`	Whether the option is disabled
`selected`	Boolean	`false`	Whether the option is selected. Managed by parent.
`active`	Boolean	`false`	Whether the option is the active (highlighted) option. Managed by parent.

Slots

Slot	Description
`(default)`	Option label content

CSS Parts

Part	Element	Description
`base`	`<div>`	Root wrapper for the option content

Visual States

Host selector	Description
`:host([selected])`	Option is currently selected
`:host([active])` / `:host([data-active="true"])`	Option is the active (highlighted) option
`:host([disabled])`	Option is disabled
`:host([hidden])`	Option is filtered out or popup is closed

cv-combobox-group

Groups related options under a labeled header. Must be a direct child of cv-combobox.

Anatomy

<cv-combobox-group> (host)
└── <slot>           ← accepts <cv-combobox-option> children

Attributes

Attribute	Type	Default	Description
`label`	String	`""`	Visible group header text. Also used for `aria-labelledby` linkage via headless `getGroupLabelProps`.

Slots

Slot	Description
`(default)`	One or more `<cv-combobox-option>` children

Visual States

Host selector	Description
`:host([hidden])`	All options in this group are filtered out

cv-combobox ​

Cross-Spec Consistency ​

Usage ​

Anatomy ​

Editable mode (default) ​

Select-only mode ​

Attributes ​

Sizes ​

Slots ​

CSS Parts ​

CSS Custom Properties ​

Visual States ​

ARIA Contract ​

Editable mode ​

Select-only mode ​

Common ​

Events ​

Reactive State Mapping ​

Attribute to Headless (UIKit -> Headless) ​

Headless to DOM (Headless -> UIKit) ​

Contract Spreading ​

UIKit-Only Concerns (NOT in headless) ​

Behavioral Contract ​

Editable Mode (default) ​

Select-Only Mode ​

Multi-Select ​

Clearable ​

Option Groups ​

Disabled State ​

Optional Advanced Behaviors (Future Scope) ​

Child Elements ​

cv-combobox-option ​

Anatomy ​

Attributes ​

Slots ​

CSS Parts ​

Visual States ​

cv-combobox-group ​

Anatomy ​

Attributes ​

Slots ​

Visual States ​

cv-combobox

Cross-Spec Consistency

Usage

Anatomy

Editable mode (default)

Select-only mode

Attributes

Sizes

Slots

CSS Parts

CSS Custom Properties

Visual States

ARIA Contract

Editable mode

Select-only mode

Common

Events

Reactive State Mapping

Attribute to Headless (UIKit -> Headless)

Headless to DOM (Headless -> UIKit)

Contract Spreading

UIKit-Only Concerns (NOT in headless)

Behavioral Contract

Editable Mode (default)

Select-Only Mode

Multi-Select

Clearable

Option Groups

Disabled State

Optional Advanced Behaviors (Future Scope)

Child Elements

cv-combobox-option

Anatomy

Attributes

Slots

CSS Parts

Visual States

cv-combobox-group

Anatomy

Attributes

Slots

Visual States