This is a recent change [1] to the spec for parsing the windowFeatures argument to window.open(). Previous to this change, window.open(url,'','popup=true') interpreted the 'popup=true' to mean popup is false. With this change, 'true' counts as a truthy value. [1] https://github.com/whatwg/html/pull/7425

Motivation

Having `popup=true` result in popup being false is counterintuitive and confusing. Making this change should make boolean features easier to use and understand.

Specification

Specification link


Final published standard: Recommendation, Living Standard, Candidate Recommendation, or similar final form

Status in Chromium

Blink


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

Owner

Search tags

window.open, windowFeatures,

Last updated on 2022-05-14