Here is the answer from the specification: https://www.w3.org/TR/SVG2/render.html#EstablishingStackingContex https://www.w3.org/TR/SVG2/render.html#Establishing

Here is the answer from the specification: https://www.w3.org/TR/SVG2/render.html#EstablishingStackingContex https://www.w3.org/TR/SVG2/render.html#EstablishingStackingC...