Bug 281126 [CSS] Illegal state exc from tab-height
If you just type a space in the CSS Editors SWT example you will get traces in the console failing on CSSValue.getFloatValue() for tab-height.
tests/org.eclipse.e4.ui.tests.css.swt/src/org/eclipse/e4/ui/tests/css/swt/CTabFolderTest.java
public void testBackgroundColor() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder("CTabFolder { background-color: #0000FF }");
		assertEquals(BLUE, folderToTest.getBackground().getRGB());
	}
	public void testTextColor() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder("CTabFolder { color: #0000FF }");
		assertEquals(BLUE, folderToTest.getForeground().getRGB());
	}
	public void testSelectedPseudo() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder(
				"CTabFolder { color: #FFFFFF; background-color: #0000FF }\n" +
				"CTabFolder:selected { color: #FF0000;  background-color: #00FF00 }");
		assertEquals(WHITE, folderToTest.getForeground().getRGB());
		assertEquals(BLUE, folderToTest.getBackground().getRGB());
		assertEquals(RED, folderToTest.getSelectionForeground().getRGB());
		assertEquals(GREEN, folderToTest.getSelectionBackground().getRGB());
	}
	
	public void testFontRegular() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder("CTabFolder { font: Verdana 16px }");
		assertEquals(1, folderToTest.getFont().getFontData().length);
		FontData fontData = folderToTest.getFont().getFontData()[0];
		assertEquals("Verdana", fontData.getName());
		assertEquals(16, fontData.getHeight());
		assertEquals(SWT.NORMAL, fontData.getStyle());		
	}
	public void testFontBold() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder("CTabFolder { font: Arial 12px; font-weight: bold }");
		assertEquals(1, folderToTest.getFont().getFontData().length);