org.scalajs.dom
A CSSStyleDeclaration is an interface to the declaration block returned by the style property of a cssRule in a stylesheet, when the rule is a CSSStyleRule.
MDN
(Since version 0.5.0) Considered abuse in typed JavaScript, will be removed in 0.6. Use js.Dynamic or js.prim.Boolean instead.
A CSSStyleDeclaration is an interface to the declaration block returned by the style property of a cssRule in a stylesheet, when the rule is a CSSStyleRule.
MDN