Bug 278091 [CSS] Measure.getCssText() with float value results in IllegalStateException
In theory we should be able to provide percentages as part of the gradients, e.g. CTabFolder:selected { background-color: #FF0000 #0000FF 30% } But this generates IllegalStateException calling getCSSText() on org.apache.batik.css.parser.CSSLexicalUnit$FloatLexicalUnit from Measure.getCSSText().
tests/org.eclipse.e4.ui.tests.css.swt/src/org/eclipse/e4/ui/tests/css/swt/GradientTest.java
static final RGB RED = new RGB(255, 0, 0);
	static final RGB GREEN = new RGB(0, 255, 0);