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[1] Note how the SVG currently implemented in browsers is a mix of SVG 1.… · whatwg/html@969c45b ( 版) <https://github.com/whatwg/html/commit/969c45b2478d1d2d3be8564ec85dc316a53c8bcf>

[2] Reference SVG 2 (dstorey著, ) <https://github.com/whatwg/html/commit/7069de4fcf2f92295dded520ed5d7275addab2e7>