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Experimental Chromium features

Polypane is a browser for developers, so it comes with some experimental Chromium features turned on by default. This means you can use Polypane to try out upcoming features before they make their way into regular browsers!

Enabled features


Prefers reduced data is a new media query that lets visitors signal they want to preserve data. You can emulate it in Polypane by going to the emulation section above a pane and toggling "prefers-reduced-data" to "reduce".

We wrote an article about what you can do with prefers-reduced-data, read that here: Creating websites with prefers-reduced-data.

Page Transition API

The page transition api will let you create animations between the current page and new pages on your domain by declare animations between elements in your CSS.


With scroll-timeline you can link an animation to the scroll position of an element. This makes it really easy to do parallax style animations.


The <selectmenu> element is an experiment to provide a more customizable select element, with a stylable interface and options.

The togglepopup and popup attributes let you create popups with all the right semantics without using JavaScript.

Spelling and grammar pseudo selectors

Use ::spelling-error and ::grammar-error to style text that the browser has flagged as containing spelling or grammar errors. Not all CSS properties are available for these styles.

Custom Highlight API

Use :highlight() and the CSS.highlights JS API to highlight arbitrary parts of a websites content.

CSS Scopes

The @scope at-rule lets you scope styling between two selectors, making in so the CSS inside it is only applied to a part of the page and not the entire page.

jpegXL support

JPEGXL is a new version of JPEG that compresses as well as avif.


Have suggestions for things you want enabled in Polypane? Let us know.


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