The total capacity of both normal and emergency venting devices shall be not less than that derived from Table H-10 except as provided in subdivision (e) or (f) of this subdivision. If unstable liquids are stored, the effects of heat or gas resulting from polymerization, decomposition, condensation, or self-reactivity shall be taken into account. The content of the mask is a single rect element, that is filled with a black-to-white gradient.Where entire dependence for emergency relief is placed upon pressure relieving devices, the total venting capacity of both normal and emergency vents shall be enough to prevent rupture of the shell or bottom of the tank if vertical, or of the shell or heads if horizontal. The latter has the mask attribute pointing to the mask element. You see a green-filled rect at the lowest layer and on top a red-filled rect. Color, opacity and such have no effect as long as they don't let parts vanish completely. Then every part of the target lying in a transparent area of the resulting clipPath's content will not be rendered. For the clipping, every path inside the clipPath is inspected and evaluated together with its stroke properties and transformation.
We now have a semicircle without having to deal with arcs in path elements. Since the rectangle covers only the upper half of the circle, the lower half of the circle will vanish: Instead its pixel data will be used to determine, which pixels of the circle "make it" to the final rendering.
Note, that the clipPath element is usually placed in a defs section. This rectangular on its own would paint the upper half of the canvas black. The attribute clip-path references a element with a single rect element. Centered at (100,100) a circle with radius 100 is painted.
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