Bug 148771 Bottom margin is invalid in PDF & HTML
Details: Bottom margin is invalid Step: 1.New a label. 2.New a data item. 3.New a label again. 4.Set bottom margin as -20 point Actual result: See the attach image
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/area/impl/AbstractArea.java
{
			style = new AreaStyle( new BIRTCSSEngine( ) );
		}
	}
	/**
	 * set allocated position
	 * 
	 * @param ax
	 * @param ay
	 */
	public void setAllocatedPosition( int ax, int ay )
	{
		x = ax
				+ PropertyUtil.getDimensionValue( style
						.getProperty( StyleConstants.STYLE_MARGIN_LEFT ) );
		y = ay
				+ PropertyUtil.getDimensionValue( style
						.getProperty( StyleConstants.STYLE_MARGIN_TOP ) );
	}
	/**
	 * set allocated height
	 * 
	 * @param aHeight
	 */
	public void setAllocatedHeight( int aHeight )
	{
		height = aHeight
				- PropertyUtil.getDimensionValue( style
						.getProperty( StyleConstants.STYLE_MARGIN_TOP ) )
				- PropertyUtil.getDimensionValue( style