Add a one-click PC & smartphone simultaneous preview to the Gutenberg block editor.

trex2026

Trex Dual Preview adds a one-click PC & smartphone simultaneous preview to the WordPress block editor (Gutenberg) sidebar.
Features
<ul>
<li>Open a modal with PC and smartphone previews side by side with one click</li>
<li>Compare PC (1200-1920px) and SP (320-768px) viewports in real time</li>
<li>Adjust display width instantly using sliders</li>
<li>Open a full-screen dual preview in a new tab</li>
<li>Automatically hides the WordPress admin bar and theme-specific toolbars (e.g. Cocoon)</li>
<li>Responsive layout that adapts to window resize via ResizeObserver</li>
</ul>
Security
<ul>
<li>Full-screen preview access is protected by wp_verify_nonce() and current_user_can()</li>
<li>iframes use the sandbox attribute to restrict unnecessary permissions</li>
<li>All input is sanitized and escaped (absint, sanitize_text_field, esc_url, etc.)</li>
</ul>

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