Agent skill

ux-icons

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SKILL.md

UX Icons

Render local and remote SVG icons in Twig templates. Icons can come from local files, Iconify.design (200+ icon sets, 200,000+ icons), or custom icon sets. Icons are inlined as <svg> elements -- no icon fonts, no external requests at runtime.

Installation

bash
composer require symfony/ux-icons

Quick Reference

ux_icon('name')                        Twig function
ux_icon('name', {class: 'w-4 h-4'})   with HTML attributes
<twig:ux:icon name="name" />           Twig component (requires ux-twig-component)
<twig:ux:icon name="set:name" />       icon from a specific set

Rendering Icons

Twig Function

twig
{{ ux_icon('menu') }}
{# renders <svg ...>...</svg> #}

{{ ux_icon('user-profile', {class: 'w-4 h-4'}) }}
{# renders <svg class="w-4 h-4"> ... </svg> #}

{{ ux_icon('user-profile', {height: '16px', width: '16px', 'aria-hidden': true}) }}
{# renders <svg height="16" width="16" aria-hidden="true"> ... </svg> #}

Twig Component (HTML Syntax)

Requires symfony/ux-twig-component.

html
<twig:ux:icon name="user-profile" class="w-4 h-4" />

<twig:ux:icon name="flowbite:user-solid" />

<twig:ux:icon name="user-profile" height="16" width="16" aria-hidden="true" />

Any HTML attribute added to the component or passed to the function is rendered on the <svg> element.

Icon Names

Local Icons

Stored in assets/icons/ by default. The file path (minus .svg) becomes the icon name:

assets/icons/
  ├─ close.svg           → ux_icon('close')
  ├─ menu.svg            → ux_icon('menu')
  └─ header/
     └─ logo.svg         → ux_icon('header:logo')

Subdirectories become prefixes separated by :. Use local icons for your own project-specific SVGs (app logo, custom illustrations).

Iconify (On-Demand)

Use prefix:name syntax to pull icons from any Iconify set:

twig
{# UI icons #}
{{ ux_icon('lucide:arrow-right') }}     {# Lucide #}
{{ ux_icon('tabler:heart') }}           {# Tabler #}
{{ ux_icon('heroicons:star-solid') }}   {# Heroicons #}
{{ ux_icon('mdi:check') }}              {# Material Design Icons #}

{# Country flags #}
<twig:ux:icon name="flagpack:fr" />
<twig:ux:icon name="flagpack:{{ country.code|lower }}" />

{# Brand logos #}
<twig:ux:icon name="simple-icons:symfony" />
<twig:ux:icon name="simple-icons:github" />

{# File type icons #}
<twig:ux:icon name="bi:filetype-pdf" />
<twig:ux:icon name="bi:filetype-{{ file.extension }}" />

On-demand icons are fetched from the Iconify API, cached locally, and inlined as SVG. No runtime HTTP requests in production.

Browse all available sets at https://icon-sets.iconify.design/

Configuration

yaml
# config/packages/ux_icons.yaml
ux_icons:
    # Local directory for icon SVG files
    icon_dir: '%kernel.project_dir%/assets/icons'

    # Default HTML attributes added to every icon
    default_icon_attributes:
        fill: currentColor
        'font-size': '1.25em'

    # Aliases: shortcut name => full icon name
    aliases:
        dots: 'clarity:ellipsis-horizontal-line'
        'tabler:save': 'tabler:device-floppy'

    # Iconify integration
    iconify:
        enabled: true
        on_demand: true
        endpoint: 'https://api.iconify.design'

    # Silently ignore missing icons (renders nothing instead of throwing)
    ignore_not_found: false

Icon Sets

Define custom icon sets with their own prefix, source, and default attributes:

yaml
ux_icons:
    icon_sets:
        # Local directory with custom attributes
        flags:
            path: '%kernel.project_dir%/assets/images/flags'
            icon_attributes:
                class: 'flag'
                fill: false           # "false" removes a default attribute

        # Alias an entire Iconify set under a shorter prefix
        icons:
            alias: 'lucide'           # ux_icon('icons:arrow-right') → lucide:arrow-right

Aliases

Create shortcuts for frequently used icons:

yaml
ux_icons:
    aliases:
        dots: 'clarity:ellipsis-horizontal-line'
        save: 'lucide:save'
        delete: 'lucide:trash-2'
        'tabler:save': 'tabler:device-floppy'   # can also remap within a set
twig
{{ ux_icon('dots') }}    {# resolves to clarity:ellipsis-horizontal-line #}
{{ ux_icon('save') }}    {# resolves to lucide:save #}

CLI Commands

Import Icons Locally

Download icons from Iconify into your local assets/icons/ directory:

bash
# Import a single icon
php bin/console ux:icons:import flowbite:user-solid

# Import multiple icons
php bin/console ux:icons:import flowbite:user-solid flowbite:home-solid

# Force overwrite existing files
php bin/console ux:icons:import flowbite:user-solid --force

Lock All On-Demand Icons

Download all icons currently used via on-demand into local files (similar to a dependency lock):

bash
php bin/console ux:icons:lock

# Force overwrite
php bin/console ux:icons:lock --force

# Verbose output (helps spot invalid icon names)
php bin/console ux:icons:lock -v

Accessibility

Icons are decorative by default. For meaningful icons, add aria-label:

twig
{# Decorative (hidden from screen readers) #}
{{ ux_icon('lucide:star', {'aria-hidden': true}) }}

{# Meaningful (announced by screen readers) #}
{{ ux_icon('lucide:star', {'aria-label': 'Favorite', role: 'img'}) }}

Key Principles

Icons are inlined SVG. No icon fonts, no <img> tags, no external HTTP requests at runtime. The SVG markup is embedded directly in your HTML. This means icons inherit currentColor, can be styled with CSS, and work offline.

On-demand is for development. During development, on-demand mode fetches icons from Iconify as needed. For production, run ux:icons:lock to download all used icons locally.

Attributes cascade. Default attributes from config < icon set attributes < per-icon attributes. Use false to remove a default attribute for a specific set or icon.

Prefer the HTML syntax. <twig:ux:icon name="..." /> reads better in templates and is consistent with other UX components.

References

  • API & Configuration (all options, attributes, icon sets): references/api.md
  • Patterns (common recipes, styling, dynamic icons): references/patterns.md
  • Gotchas (common mistakes, debugging, caching): references/gotchas.md

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