One of the most important things in WordPress is users being able to feel confident as they make changes to their content and more generally to their sites. Being able to make non-destructive changes and preview them is an important component of building that trust. This is perhaps most noticeable in the “save and surprise” approach of the widgets admin screen – every time you add a new widget, modify its settings, or move one around, the changes are saved and appear live on your site, even if you’re not ready yet. The customizer is our framework for live previewing changes. We are committed to providing live preview for all aspects of site customization and making it usable on all devices from phones to large screens. The customizer is the result of a tremendous amount of work over many releases. It was first introduced in 3.4. In 3.9, it received its first big updates in the form of widgets support and improved header upload and cropping. 4.0 brought panels and contextual controls. Development really started to take off in 4.1 when JS-templated customizer controls and a JS api were introduced, making possible an ecosystem of live preview compatible plugins and themes. 4.2 followed
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