Best polyfill plugins for WordPress
The most popular polyfill plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. HTML5 Details Polyfill leads with 50+ active installs, ahead of Compatiblizr (10+). All 2 plugins tagged “polyfill” are below, with figures from WordPress.org that update every day.
Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.
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Top 2 polyfill plugins
- 1.
HTML5 Details PolyfillThe most installed polyfill plugin, with 50+ active installs. Only 4 reviews so far, last updated 14 years ago. Tested only up to WordPress 3.4.2.
- 2.
Compatiblizr10+ active installs. No reviews yet, last updated 12 years ago. Tested only up to WordPress 3.9.40.
All 2 plugins tagged “polyfill”
HTML5 Details Polyfill
Up in the last 7 days:141#20,786by j14 years ago
Adds fallback support for the HTML5 <details> and <summary> elements in browsers that don't support them.
- Installs
- 50+
- Rating
- 5.0(4)
- Downloads
- 0/day
Compatiblizr
Down in the last 7 days:239#47,415by Designer02312 years ago
Plugin for patching old versions of IE (7 and 8)to work with CSS3 selectors and Media Queries.
- Installs
- 10+
- Rating
- –
- Downloads
- 0/day