Function assertMargins

test/jasmine/tests/gl3d_plot_interact_test.js:1464–1470

(t, l, b, r)

        var h = 500;

        function assertMargins(t, l, b, r) {
            var div3d = document.getElementById('scene');
            expect(parseFloat(div3d.style.top)).toEqual(t, 'top');
            expect(parseFloat(div3d.style.left)).toEqual(l, 'left');
            expect(h - parseFloat(div3d.style.height) - t).toEqual(b, 'bottom');
            expect(w - parseFloat(div3d.style.width) - l).toEqual(r, 'right');
        }

        Plotly.newPlot(gd, [{
            type: 'scatter3d',