Verify the basic capability to handle the feOffset, feMerge and feFlood filter nodes. Four copies of the string "Offset,Merge,Flood" should appear at various offsets and colors. At each position a reference crosshair is drawn to indicate the expected color, opacity and position for the filter element. These targets are drawn with standard svg line elements.

The rendered image should match the reference image. Additionally, the target crosshairs should match the color, text origin, and opacity of each copy of the filtered graphic.

In addition to feFlood, feMerge, and feOffset, this test uses 'feComposite' to recolor the SourceGraphic with the feFlood color. The source graphic uses 'text' with 'font-size', 'font-family' and 'font-weight'. The target cross hairs are drawn with 'line' and use 'stroke-width', 'stroke-color', and 'stroke-opacity'.