New WordPress Sandbox Project Demos: Test-Drive Themes and Plugins in the Browser – WP Tavern

WordPress Sandbox, an experimental project that uses WebAssembly (WASM) to run WordPress in the browser without a PHP server, has been chugging along steadily since Automattic-sponsored core contributor Adam Zieliński introduced it earlier this year in September.

Zieliński published three new updates to Twitter this week, demonstrating the project’s potential to provide an in-browser IDE for plugin development along with a quick way to spin up a test environment for themes and plugins.

In the first example, he shows how the project could be used to test-drive themes from WordPress’ Themes Directory right in the browser. Clicking the demo URL will launch a site with the Pendant theme active, but the theme can be changed to another from the directory by appending a different theme name to the end of the URL. All your changes made on the demo are private and disappear after a page refresh. With a few improvements, this could be transformative for previewing themes on

With WordPress Sandbox, you can test-drive themes from the directory right in your browser.

For example, click here to try Pendant theme:

You can replace “pendant” in the URL with another theme from the directory.

— Adam Zieliński (@adamzielin)

Zieliński also showed WordPress Sandbox’s potential for test-driving plugins directly in the browser. The example uses CoBlocks but can be changed to any other plugin from the directory by replacing the plugin name. Having this available to WordPress users would greatly speed up the plugin selection process in cases where it’s not clear if a plugin will do what you hope it will do. It would also be handy if you could append multiple plugin slugs to the URL to install more than one.

With WordPress Sandbox, you can test-drive plugins from the directory right in your browser.

For example, click here to try CoBlocks:

You can replace “coblocks” with another plugin from the directory.

— Adam Zieliński (@adamzielin)

The most recent demo is a video showing how the project can be used to create an in-browser IDE for plugin development, where changes are displayed live.

The future of WordPress development?

Build plugins in your browser and see the results live.

Here’s an early demo with WordPress Sandbox – there is no WordPress running on the backend!

— Adam Zieliński (@adamzielin)

For more examples of WordPress Sandbox’s capabilities, check out the quick showcase Zieliński built and play around with a live in-browser WordPress instance to see the site updated instantly as you code.

This content was originally published here.