Deprecated

For a given set of browsers, what APIs are removed in all of them how many days it take for the API to removed in the first browser to the last.

Example Comparisons
Browsers
Features

Summary

A count of the number of APIs that were removed from A first and B last.
Last removed from ChromeLast removed from Safari
First removed from Chrome 2
First removed from Safari 4

Average time for an API to be removed across Chrome and Safari

6 APIs took an average of 2001.42 days to be removed

API breakdown:

Average time to landing by year of first deprecation

If a feature is deprecated in the earliest browser in 20XX it took Y days on average to become deprecated in the last browser (when considering Chrome and Safari). TTA (time to available).
CSS APIsCSS TTA
2017 13209.08
2020 12235.08
2021 41641.08

Deprecated APIs

Below is a list of features that are deprecated in Chrome and Safari

Raw Data

Quick Links:

CSS Data

API First Browser Date Last Browser Date Days Notes
css.at-rules.media.prefers-color-scheme.no-preference Chrome2/4/2020 Safari9/20/2021
css.properties.-webkit-mask-repeat-x Safari9/20/2021 Chrome12/5/2023
css.properties.-webkit-mask-repeat-y Safari9/20/2021 Chrome12/5/2023
css.properties.background-repeat-x 📋Safari9/20/2021 Chrome12/5/2023
Safari: CSS.supports('background-repeat-x') returns true, but the property has no effect.Safari on iOS: CSS.supports('background-repeat-x') returns true, but the property has no effect.WebView on iOS: CSS.supports('background-repeat-x') returns true, but the property has no effect.
css.properties.background-repeat-y 📋Safari9/20/2021 Chrome12/5/2023
Safari: CSS.supports('background-repeat-y') returns true, but the property has no effect.Safari on iOS: CSS.supports('background-repeat-y') returns true, but the property has no effect.WebView on iOS: CSS.supports('background-repeat-y') returns true, but the property has no effect.
css.properties.zoom.reset Chrome6/5/2017 Safari3/31/2025