Wp elementor skill

WordPress & Elementor Pro — Skill Router

A complete procedural guide for producing production-grade WordPress and Elementor Pro code. This file is the router — read it first, then load the relevant sub-file(s) for the task at hand.

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Sub-file Map — Read the Right File for Each Task

Task type	Read this file
Plugin scaffold, child theme, code placement, CPT, AJAX handler	scaffolding.md
PHP standards, sanitization, escaping, nonces, WP_Error, transients, password hashing	php-standards.md
JavaScript standards, enqueue API, defer/async, wp_add_inline_script	js-css-standards.md
CSS standards, BEM, design tokens, Elementor CSS selectors	js-css-standards.md
Elementor custom widget, Dynamic Tags, Loop Grid, Form actions, Theme Builder conditions	elementor-patterns.md
Elementor extension points — custom form fields, theme locations, injecting controls into native widgets, Finder/context-menu, hooks reference, deprecations	elementor-extending.md
WooCommerce HPOS, order API, template overrides, Loop Grid for products	woocommerce.md
REST API endpoints, schema, permission callbacks	rest-api.md
Off-canvas UI, off-canvas accessibility, focus trap	offcanvas-ui.md
Performance checklists (frontend + backend), speculative loading, IE conditional comments	performance.md
Accessibility checklist, WCAG 2.2 AA, ARIA patterns	performance.md
Hard-won production gotchas — widget lifecycle fatals, content_template() escaping, CSS-in-Elementor footguns, transactional email, wp.org review/packaging, embedding apps	field-notes.md
wordpress.org submission — the 18 Directory Guidelines, Plugin Check 2.0.0 categories/usage, review process, required headers/readme	wp-org-guidelines.md
Subversion (SVN) — deploying/tagging a release on the wordpress.org plugin/theme SVN (trunk/tags/assets), the daily work cycle, branching/merging, properties, repo admin	svn/svn.md (self-contained sub-bundle; svn/references/ goes deeper)
Debugging & static analysis — PHPCS+WPCS, PHPStan, Plugin Check, WP_DEBUG/Query Monitor, Elementor Safe Mode/cache, symptom→cause table	debugging.md
Common WordPress APIs — admin settings page (Settings + Options API), register_meta, roles/capabilities, WP-Cron, internationalization (i18n)	wordpress-apis.md

Widget Boilerplates — Load when building a widget of that type

Widget type	Read this file
Button / CTA with icon and link	widget-button.md
Container / layout wrapper / section / card shell	widget-container.md
Image with caption, link, lightbox	widget-image.md
Heading / title / HTML tag selector	widget-heading.md
Rich text / WYSIWYG body content	widget-text-editor.md
Video embed (YouTube, Vimeo, self-hosted)	widget-video.md
Widget that renders a saved Elementor template by ID	widget-elementor-template.md (SELECT2, get_builder_content_for_display(), Dynamic Tags context, CSS timing)
Widget whose markup lives in a separate PHP template file	widget-php-template.md (Strategies A/B/C, load_template(), ob_start, path-traversal safety)
Divider / horizontal rule with optional text or icon	widget-divider.md
Spacer / vertical gap	widget-spacer.md
Single standalone icon with optional link	widget-icon.md
Icon + title + description box	widget-icon-box.md
Image + title + description box	widget-image-box.md
Image grid / gallery	widget-image-gallery.md
Image slider / carousel	widget-image-carousel.md
Bullet list with icons per item	widget-icon-list.md
Animated number counter	widget-counter.md
Percentage progress bar	widget-progress.md
Customer quote / testimonial	widget-testimonial.md
Tabbed content panels	widget-tabs.md
Accordion — one panel open at a time	widget-accordion.md
Toggle — multiple panels open simultaneously	widget-toggle.md
Social media icon links row	widget-social-icons.md
Colored alert / notice box	widget-alert.md
Audio player (SoundCloud / self-hosted)	widget-audio.md
WordPress shortcode output	widget-shortcode.md
Raw custom HTML / JS / CSS embed	widget-html.md
Named anchor for in-page navigation	widget-menu-anchor.md
WordPress registered sidebar output	widget-sidebar.md
WordPress <!--more--> read more tag	widget-read-more.md
Google Maps embed	widget-google-maps.md
Decorative star rating display	widget-star-rating.md
Schema-ready structured rating	widget-rating.md
Text following a curved / custom SVG path	widget-text-path.md
Nested Tabs / Nested Accordion (each panel is a Container holding any widgets)	widget-nested.md

Always read the relevant sub-file before writing code. For tasks that span multiple areas (e.g. a WooCommerce widget with custom REST endpoint), read all relevant sub-files. For a widget task, read BOTH the widget boilerplate file AND elementor-patterns.md. For any custom widget, plugin, or wp.org-bound work, also skim field-notes.md — it catches the lint-passing, review-failing, site-down mistakes the topic files don't dwell on.

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0. Golden Rules (Never Violate)

These override everything in all sub-files:

1. Native APIs first — WordPress core hook before plugin; Elementor API before template override.
2. Sanitize in, escape out — Every input sanitized. Every output escaped. No exceptions.
3. Prefix everything — All functions, classes, constants, hooks, and CSS classes use a project-specific prefix.
4. State your placement — Every code response must declare exactly where the code lives.
5. No over-clarifying — Only ask a clarification question if the missing info would materially change the code output. Otherwise, state your assumption and proceed.
6. NEVER hardcode visual settings in widgets — Every visual property (colors, fonts, sizes, spacing, backgrounds, borders, shadows, alignment) MUST be exposed as a standard Elementor control in the editor panel. Users control appearance via the toolbar — not by editing code. See §5 "Mandatory Widget Controls" below for the required controls checklist.
7. Name for the directory from day one — Naming is decided first and is effectively irreversible, so get it right before writing code. The plugin slug/name must NOT start with a trademark you don't own — "CRM for WooCommerce", never "WooCommerce CRM" (Directory Guideline 17). The text domain must exactly equal the plugin slug. The wp.org slug is permanent, and a widget's get_name() is sticky (stored in every page's _elementor_data — renaming it breaks placed widgets). Choose the public name, slug, text domain, and code prefix (Rule #3) together, once. This is distinct from Rule #3: that governs internal code symbols; this governs the public identity. See wp-org-guidelines.md (Guidelines 12/16/17) and field-notes.md §1 (sticky get_name()).

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1. Default Assumptions

Quickly assess — only ask if the answer would change the code:

Info needed	Ask only if...
Scope (plugin vs snippet vs child theme)	Context doesn't make it obvious
Elementor tier (Free / Pro / custom widget)	Pro-only APIs are involved
PHP version	Code uses PHP 8.3+ features like typed class constants, or 8.4+ features like property hooks
WooCommerce / ACF / WPML present	Integration with those systems is required

Default stack when not stated (full release-by-release history lives in CHANGELOG.md — keep volatile version-tracking out of this router):

Component	Version	Notes
WordPress	7.0+	"Armstrong", released May 20, 2026; current point release 7.0.2 (security, Jul 17, 2026). Minimum PHP raised to 7.4 (7.2/7.3 dropped — sites still on them stay pinned to 6.9.x). No multisite assumed. WP 7.1 is scheduled for Aug 19, 2026.
PHP	8.3 recommended	7.4 = WP 7.0 minimum. 8.4 / 8.5 = "beta support" (possible deprecation notices). 8.2 fully compatible but no longer the recommended default.
Elementor (free + Pro)	4.2+	Separate plugins with independent version numbers. 4.0.0 (Mar 30, 2026) made the Atomic Editor stable + default for new installs; free and Pro both reached 4.2.0 on Jul 20, 2026 (free: Atomic Grid; Pro: Atomic Loop). V3 Widget_Base remains fully supported — all skill code targets V3 and is production-safe.
WooCommerce	10.9+	HPOS default-on since 8.2. 10.7 (Apr 14, 2026) disabled HPOS "sync on read" by default; 10.9 (Jun 23, 2026) defers Store API draft-order creation — see woocommerce.md.

Note: Elementor core and Elementor Pro have independent version numbers — always check both when diagnosing compatibility issues.

WordPress 7.0 — what changed for plugin / Elementor devs

WP 7.0 "Armstrong" shipped May 20, 2026 (delayed from the original April 9 target while the RTC storage layer was redesigned — see below). Everything below is opt-in and non-breaking; most plugin/Elementor work is unaffected.

• Minimum PHP is now 7.4 (7.2/7.3 dropped). The skill's recommended baseline stays PHP 8.3. Bump your plugin's Requires PHP header to 7.4 only once you target WP 7.0+ exclusively. No new DB minimum is enforced; wordpress.org/about/requirements/ recommends MariaDB 10.6+ or MySQL 8.0+.
• Real-Time Collaboration (RTC): simultaneous multi-author block editing (CRDT-based, via an HTTP-polling sync provider — not WebRTC). Data is stored in a dedicated core database table; an earlier wp_post_meta / wp_sync_storage design was rejected, and building the table is what pushed the release from April to May. Plugin impact: scope every WP_Query / get_posts() with an explicit post_type so internal core post types never leak into your results — do not hardcode any internal RTC type name. The WP_ALLOW_COLLABORATION constant lets hosts swap the sync transport.
• WP AI Client: provider-agnostic PHP + JS AI API — wp_ai_client_prompt( $prompt )->generate_text(). Guard with function_exists( 'wp_ai_client_prompt' ).
• Abilities API: wp_register_ability() (PHP, since WP 6.9) plus a JS counterpart in 7.0. Use 'meta' => ['show_in_rest' => true] to expose via REST. Register ONLY inside the wp_abilities_api_init hook (core renamed the feature plugin's abilities_api_init; categories go on wp_abilities_api_categories_init) or you get _doing_it_wrong; a category is required and must already be registered. Calling it also sets your real Requires at least floor to 6.9 — Plugin Check errors on the header and function_exists() guards don't count (see debugging.md §1).
• Connectors UI (Settings → Connectors) for managing AI provider credentials, and a Command Palette in wp-admin.
• Iframed editor remains punted to a later release — prepare with "apiVersion": 3 in block.json.

Sources: make.wordpress.org/core/2026/01/09/dropping-support-for-php-7-2-and-7-3/ · make.wordpress.org/core/2026/04/22/wordpress-7-0-release-party-updated-schedule/ · wordpress.org/about/requirements/

📌 PHP support labels (WP 7.0): PHP 7.4–8.3 fully compatible; 8.3 recommended; 8.4 (WP 6.7+) and 8.5 (WP 6.9+) carry a "beta support" label (possible deprecation notices). Source: make.wordpress.org/core/handbook/references/php-compatibility-and-wordpress-versions/

✅ Elementor 4.x status (current: 4.2.0 free AND Pro, July 20, 2026): Elementor 4.0.0 (Mar 30, 2026, free + Pro) made the Atomic Editor stable and the default for new installs and added Atomic Forms, Pro Interactions, and Component creation. Updating to 4.x leaves existing sites untouched — V3 widgets and V4 Atomic Elements coexist on the same page; Atomic features are toggled at WP Admin → Elementor → Editor → Settings. The V4 Atomic Element PHP extension API is stable, but third-party extension docs are still being finalized (re-verified July 22, 2026: developers.elementor.com still documents only V3) — so continue using V3 Widget_Base for all third-party widgets. It is the correct, production-safe API and all skill code targets it.

V4 Atomic Elements that now ship by default (awareness only — not third-party-buildable yet): Div Block & Flexbox Container (layout); Atomic Grid — advanced row/column layouts (free 4.2.0, Jul 20, 2026); Atomic Heading, Paragraph, Image, Button, Video, SVG; Atomic Tabs; Atomic Forms (Pro) with composable fields — Label, Input, Textarea, Checkbox, Submit, plus Radio, Select, Date Picker, Time Picker, and File Upload (added in Pro 4.1.0, May 26, 2026); and Atomic Loop — dynamic content layouts, the V4 counterpart of the Pro Loop Grid (Pro 4.2.0, Jul 20, 2026). These are end-user elements; building custom atomic elements still awaits the finalized V4 extension docs — keep targeting V3 Widget_Base until then. Source: elementor.com/products/website-builder/v4-faq/ · developers.elementor.com/elementor-editor-4-0-developers-update/ · elementor.com/pro/changelog/ · github.com/elementor/elementor/releases

🗓️ Release-by-release history (betas, RCs, point releases) lives in CHANGELOG.md. Keep this router focused on durable guidance; update version facts in the table above and in CHANGELOG.md, not scattered across the sub-files.

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2. Architecture Decision Tree

Run through this mentally before writing a single line:

Does a WordPress core hook (add_action/add_filter) solve it?
  YES → Use the hook. No plugin needed. Place in child theme functions.php
        or Elementor Custom Code.
  NO  → Does Elementor's PHP/JS API solve it?
          YES → Extend via Elementor hooks, Dynamic Tags, or Widget_Base.
                Register via elementor/widgets/register or elementor/dynamic_tags/register.
          NO  → Is this logic reusable across themes or sites?
                  YES → Scaffold a dedicated plugin (see scaffolding.md).
                  NO  → Child theme functions.php or Elementor Custom Code block.

Is a WooCommerce override needed?
  → Use Elementor Loop Grid + custom query filter BEFORE touching template files.
  → Only override woocommerce/ templates as an absolute last resort.

Is this a REST API endpoint?
  → Always register via register_rest_route() inside a plugin, never in functions.php.

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3. Mandatory Output Format

Every single code response must follow this structure — no exceptions:

📍 PLACEMENT
Exact file path or Elementor hook location.
e.g. /wp-content/plugins/myplugin/includes/class-myplugin-hooks.php
     Elementor → Site Settings → Custom Code → wp_footer

⚙️ REQUIRES
WordPress X.X+ | PHP X.X+ | Elementor Pro X.X+ | ACF X.X+ | WooCommerce X.X+
(list only what the code actually depends on)

💡 WHY THIS APPROACH
One paragraph: which branch of the §2 decision tree was taken and why.

📋 CODE
Complete, commented, deployment-ready code block — no truncation, no omissions.

🔧 INTEGRATION NOTES (include when relevant)
Any manual steps required: flush rewrite rules, set Query ID in Elementor editor,
activate plugin, clear Elementor cache, etc.

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4. Quick Reference — Pattern Index

Task	Approach	Sub-file
Plugin scaffold	Singleton + hooks class + assets class + HPOS declaration	scaffolding.md
Child theme setup	wp_enqueue_style parent + child in functions.php	scaffolding.md
Custom Post Type + Taxonomy	register_post_type() + register_taxonomy() in plugin	scaffolding.md
Secure AJAX handler	wp_ajax_ hooks + nonce verify + wp_send_json_*	scaffolding.md
PHP sanitization / escaping	wp_unslash() + sanitize_* + esc_* patterns	php-standards.md
Transient caching	get_transient / set_transient	php-standards.md
External API call + WP_Error	wp_remote_get() + WP_Error pattern	php-standards.md
Admin settings page	Settings API + register_setting + sanitize_callback + settings_fields	wordpress-apis.md
Store plugin options	Options API + explicit boolean autoload (WP 6.6+)	wordpress-apis.md
Custom field exposed to REST / Elementor	register_post_meta + show_in_rest	wordpress-apis.md
Scheduled / background task	WP-Cron (wp_schedule_event) + Action Scheduler for heavy jobs	wordpress-apis.md
Make a plugin translatable	i18n functions + text-domain = slug + WP 6.7 init-timing rule	wordpress-apis.md
Deploy / tag a plugin release on wp.org SVN	svn co → copy to trunk/ → svn cp trunk tags/X.Y.Z → svn ci (assets/ is a sibling)	svn/svn.md
Any SVN task (checkout, commit, branch, merge, conflicts, repo admin)	Subversion sub-bundle	svn/svn.md
WP 6.8 password hashing	wp_check_password() + wp_password_needs_rehash()	php-standards.md
WP 6.8 app password / key hashing	wp_fast_hash() + wp_verify_fast_hash() (BLAKE2b)	php-standards.md
JS standards + enqueue defer/async	IIFE + WP 6.3+ enqueue API	js-css-standards.md
PHP → JS data passing	wp_add_inline_script() with wp_json_encode()	js-css-standards.md
CSS BEM + design tokens	Scoped tokens, 8pt spacing, fluid type	js-css-standards.md
Custom Elementor widget	Widget_Base + all required methods	elementor-patterns.md
Elementor Dynamic Tag	Tag class + elementor/dynamic_tags/register	elementor-patterns.md
Elementor Loop Grid query	elementor/query/ filter	elementor-patterns.md
ACF field in Elementor	Dynamic Tag extending \Elementor\Core\DynamicTags\Tag	elementor-patterns.md
Elementor Pro Form action	Action_Base + field iteration	elementor-patterns.md
Theme Builder custom condition	Condition_Base + elementor/theme/register_conditions	elementor-patterns.md
Elementor Pro custom form field	Field_Base + elementor_pro/forms/fields/register	elementor-extending.md
Theme Builder custom location	register_location + elementor_theme_do_location()	elementor-extending.md
Add a control to a NATIVE Elementor widget	elementor/element/{el}/{section}/before_section_end	elementor-extending.md
Filter a native widget's output	elementor/widget/render_content filter	elementor-extending.md
WooCommerce HPOS compatibility	FeaturesUtil::declare_compatibility() + wc_get_order()	woocommerce.md
WooCommerce loop	Loop Grid + elementor/query/ filter	woocommerce.md
Custom REST endpoint	register_rest_route() + schema callback in plugin	rest-api.md
Off-canvas filter panel	BEM CSS + ARIA JS + Custom Code block	offcanvas-ui.md
Performance checklist	Frontend + backend checklists	performance.md
Accessibility checklist	WCAG 2.2 AA patterns	performance.md
Elementor dependency check	Requires Plugins: elementor header + did_action fallback	scaffolding.md
Widget with button/CTA	Controls + render matching native Button widget	widget-button.md
Widget with container/layout	Controls + render matching native Container	widget-container.md
Widget with image	Group_Control_Image_Size + get_attachment_image_html()	widget-image.md
Widget with heading	TEXTAREA + header_size tag selector	widget-heading.md
Widget with rich text	WYSIWYG + wp_kses_post output	widget-text-editor.md
Widget with video embed	Source SELECT + overlay + aspect ratio	widget-video.md
Widget rendering saved Elementor template	get_builder_content_for_display() + SELECT2	widget-elementor-template.md
Widget with PHP template file	load_template() + locate_template() strategies A/B/C	widget-php-template.md
Widget with divider line	Style + width + optional text/icon element	widget-divider.md
Widget with spacer gap	Single responsive SLIDER	widget-spacer.md
Widget with single icon	ICONS control + size + color tabs	widget-icon.md
Widget with icon + text box	Icon + title + description pattern	widget-icon-box.md
Widget with image + text box	Image + title + description pattern	widget-image-box.md
Widget with image grid	GALLERY control + Group_Control_Image_Size	widget-image-gallery.md
Widget with image slider	GALLERY + Swiper + navigation controls	widget-image-carousel.md
Widget with icon bullet list	REPEATER + icon + text + optional link	widget-icon-list.md
Widget with animated counter	Number + prefix/suffix + duration	widget-counter.md
Widget with progress bar	Percentage SLIDER + bar styling	widget-progress.md
Widget with testimonial quote	Content + image + name + job title	widget-testimonial.md
Widget with tabbed panels	REPEATER tabs + horizontal/vertical type	widget-tabs.md
Widget with accordion	REPEATER + single-open collapse pattern	widget-accordion.md
Widget with toggle panels	REPEATER + multi-open toggle pattern	widget-toggle.md
Widget with social icons	REPEATER + brand icons + links	widget-social-icons.md
Widget with alert/notice box	Type SELECT + title + description + dismiss	widget-alert.md
Widget with audio player	SoundCloud URL + autoplay options	widget-audio.md
Widget outputting shortcode	TEXTAREA + do_shortcode()	widget-shortcode.md
Widget with raw HTML embed	CODE control + unescaped output	widget-html.md
Widget as named anchor	TEXT ID + sanitize_html_class()	widget-menu-anchor.md
Widget outputting sidebar	Registered sidebar SELECT + dynamic_sidebar()	widget-sidebar.md
Widget with read more tag	No controls — WordPress $more global	widget-read-more.md
Widget with Google Maps	Address TEXT + zoom SLIDER + iframe	widget-google-maps.md
Widget with star rating display	Scale + rating number + icon style	widget-star-rating.md
Widget with schema rating	Icon count + fractional rating + gap	widget-rating.md
Widget with curved/path text	<svg> + <textPath> + unique path id	widget-text-path.md
Nested Tabs / Accordion widget	Widget_Nested_Base + print_child() + container panels	widget-nested.md

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5. Mandatory Widget Controls — No Hardcoded Visuals (NEVER VIOLATE)

This section is MANDATORY for every custom Elementor widget. Whenever you build a widget, every visual property must be an Elementor control — NEVER a hardcoded CSS value. Users control appearance from the editor panel/toolbar, not by editing source code.

The Rule

NEVER hardcode any of the following in PHP render(), in static CSS, or in content_template() output:

• Colors (text, background, border, shadow)
• Typography (font family, size, weight, line-height, letter-spacing, transform)
• Spacing (padding, margin, gap)
• Sizing (width, height, min/max values)
• Borders (style, width, color, radius)
• Shadows (box-shadow, text-shadow)
• Backgrounds (color, gradient, image)
• Alignment / positioning
• Opacity, transitions, hover effects

ALL of the above must use Elementor controls with selectors that inject CSS dynamically. The only exceptions are structural CSS (display, position, overflow) required for the widget layout to function at all — and even these should use controls when there is a user-facing choice (e.g. flex-direction toggle).

Required Controls Checklist — Apply to Every Widget

When building a widget, include ALL controls that apply to its visual elements. Use this checklist as a mandatory gate:

Visual property	Required Elementor control	Tab
Text content	TEXT, TEXTAREA, or WYSIWYG + 'dynamic' => ['active' => true]	TAB_CONTENT
Typography (any text element)	add_group_control( Group_Control_Typography::get_type() )	TAB_STYLE
Text color	COLOR control with selectors	TAB_STYLE
Text alignment	add_responsive_control() with CHOOSE (left/center/right/justify)	TAB_STYLE or TAB_CONTENT
Background	add_group_control( Group_Control_Background::get_type() )	TAB_STYLE
Border	add_group_control( Group_Control_Border::get_type() )	TAB_STYLE
Border radius	add_responsive_control() with DIMENSIONS + 'selectors'	TAB_STYLE
Box shadow	add_group_control( Group_Control_Box_Shadow::get_type() )	TAB_STYLE
Text shadow	add_group_control( Group_Control_Text_Shadow::get_type() )	TAB_STYLE
Padding	add_responsive_control() with DIMENSIONS	TAB_STYLE
Margin	add_responsive_control() with DIMENSIONS	TAB_STYLE
Width / Height	add_responsive_control() with SLIDER	TAB_STYLE
Spacing / Gap	add_responsive_control() with SLIDER	TAB_STYLE
Image	MEDIA + add_group_control( Group_Control_Image_Size::get_type() )	TAB_CONTENT
CSS Filters (if image/element)	add_group_control( Group_Control_Css_Filter::get_type() )	TAB_STYLE
Hover state	Duplicate color/background/shadow controls inside 'section_style_hover' with selectors targeting :hover	TAB_STYLE
Transition duration	SLIDER (seconds) with selectors => ['transition-duration']	TAB_STYLE
Link	URL control with 'dynamic' => ['active' => true]	TAB_CONTENT
Icon	ICONS control with fa4compatibility	TAB_CONTENT
HTML tag	SELECT (h1–h6, div, span, p)	TAB_CONTENT

Example — Correct vs Incorrect

// ❌ WRONG — hardcoded color and font-size
protected function render(): void {
    $settings = $this->get_settings_for_display();
    echo '<h2 style="color: #e94560; font-size: 24px;">'
        . esc_html( $settings['title'] ) . '</h2>';
}

// ✅ CORRECT — all visuals controlled from the panel via selectors
protected function register_controls(): void {
    // ... Content section with title TEXT control ...

    $this->start_controls_section( 'section_title_style', [
        'label' => esc_html__( 'Title Style', 'myplugin' ),
        'tab'   => \Elementor\Controls_Manager::TAB_STYLE,
    ] );

    $this->add_control( 'title_color', [
        'label'     => esc_html__( 'Color', 'myplugin' ),
        'type'      => \Elementor\Controls_Manager::COLOR,
        'selectors' => [
            '{{WRAPPER}} .myplugin-widget__title' => 'color: {{VALUE}};',
        ],
    ] );

    $this->add_group_control(
        \Elementor\Group_Control_Typography::get_type(),
        [
            'name'     => 'title_typography',
            'selector' => '{{WRAPPER}} .myplugin-widget__title',
        ]
    );

    $this->add_responsive_control( 'title_align', [
        'label'   => esc_html__( 'Alignment', 'myplugin' ),
        'type'    => \Elementor\Controls_Manager::CHOOSE,
        'options' => [
            'left'   => [ 'title' => esc_html__( 'Left',   'myplugin' ), 'icon' => 'eicon-text-align-left' ],
            'center' => [ 'title' => esc_html__( 'Center', 'myplugin' ), 'icon' => 'eicon-text-align-center' ],
            'right'  => [ 'title' => esc_html__( 'Right',  'myplugin' ), 'icon' => 'eicon-text-align-right' ],
        ],
        'selectors' => [
            '{{WRAPPER}} .myplugin-widget__title' => 'text-align: {{VALUE}};',
        ],
    ] );

    $this->add_responsive_control( 'title_spacing', [
        'label'      => esc_html__( 'Bottom Spacing', 'myplugin' ),
        'type'       => \Elementor\Controls_Manager::SLIDER,
        'size_units' => [ 'px', 'em', 'rem' ],
        'range'      => [ 'px' => [ 'min' => 0, 'max' => 100 ] ],
        'selectors'  => [
            '{{WRAPPER}} .myplugin-widget__title' => 'margin-bottom: {{SIZE}}{{UNIT}};',
        ],
    ] );

    $this->end_controls_section();
}

protected function render(): void {
    $settings = $this->get_settings_for_display();
    // ✅ No inline styles — all visuals come from Elementor's selectors
    $this->add_render_attribute( 'title', 'class', 'myplugin-widget__title' );
    $this->add_inline_editing_attributes( 'title' );
    echo '<h2 ' . $this->get_render_attribute_string( 'title' ) . '>'
        . esc_html( $settings['title'] ) . '</h2>';
}

add_render_attribute() and add_inline_editing_attributes() — Always Use

The official Elementor API for building HTML attributes is $this->add_render_attribute(). Always use it instead of manually concatenating class/id/aria attributes in render(). Pair with $this->add_inline_editing_attributes() for any text field that supports live editing in the Elementor editor panel.

Outputting the built attributes — pick by context: use get_render_attribute_string( 'key' ) when you are concatenating into a string (as in the echo '<h2 ' . ... . '>' example above), and print_render_attribute_string( 'key' ) when you are echoing directly inside a ?> … <?php HTML block (e.g. <h2 <?php $this->print_render_attribute_string( 'title' ); ?>>). Both are correct Elementor APIs — print_* simply echoes what get_* returns. The widget sub-files use the print_* form inside their HTML templates.

Source: developers.elementor.com/docs/widgets/rendering-html-attribute/ Source: developers.elementor.com/docs/widgets/rendering-inline-editing/