The [Constructable StyleSheets](https://wicg.github.io/construct-stylesheets/) API was added under a preference in [bug 1604296](https://bugzilla.mozilla.org/show_bug.cgi?id=1604296). This patch aims to fully implement and test the functionality of the CSSStyleSheet [replaceSync()](https://wicg.github.io/construct-stylesheets/#dom-cssstylesheet-replacesync) function.
Bug 1607268 Comment 0 Edit History
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The [Constructable StyleSheets](https://wicg.github.io/construct-stylesheets/) API was added under a preference in [bug 1604296](https://bugzilla.mozilla.org/show_bug.cgi?id=1604296). This patch aims to fully implement and test the functionality of the CSSStyleSheet [replaceSync()](https://wicg.github.io/construct-stylesheets/#dom-cssstylesheet-replacesync) function, which is currently a stub.