web-feature: Let and const

baseline logo Widely available

The let and const declarations define block-scoped variables.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

WPE MiniBrowser

Linux

2026-05

Servo

Android

2026-05

Chrome Browser

Android

49

Safari Browser

iOS

10

Notes

Support data provided by: BCD logo

Know something we don't?

Is any of the above data outdated? Or do you want to add a new WebView to the list? Heads on to GitHub and edit the data file!

Edit this page on GitHub Report an issue on GitHub

Not comfortable with GitHub? Send us an email.

Please help us keeping this data updated

This feature was last updated on May 02, 2026.