Internal "custom CSS properties" defined in SVGRenderer, such as textOutline, are by default not applied as DOM element style properties, i.e. they are stripped from style before it's applied to an element.
Properties like textOutline are applied as style properties along with the rest. As long as they're invalid CSS (for the given CSS parser implementation) they're ignored, so it's not an issue as of itself, but apart from showing up in dev tools, they pose a forward-compatibility risk (of actually becoming valid).
Live demo with steps to reproduce
Any demo using textOutline suffices, e.g. this one. Just inspect the text node of any data label.
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Internal "custom CSS properties" are applied to DOM nodesMar 15, 2017