How do I add a carousel slider to WordPress without a plugin?

Add the OneType Transforms script tag via the free WPCode plugin (Code Snippets > Header & Footer), then place a Custom HTML block in Gutenberg with your carousel markup using the ot="swiper" attribute.

Does this carousel work with Elementor and Divi?

Yes. Use the HTML widget in Elementor or a Code Module in Divi to add the carousel markup. The script tag can be added via WPCode, Elementor Custom Code (Pro), or Divi Theme Options.

Is this lighter than Revolution Slider or Smart Slider?

Yes. Traditional slider plugins load 200-500KB+ of assets and add database queries. The OneType carousel loads only what you use from a CDN with no admin overhead or plugin conflicts.

WordPress Carousel - How to Add One Without a Plugin