public void setSvg(final SvgImage svgImage) {
        final SafeHtml safeHtml = new SafeHtmlBuilder().append(BACKGROUND_DIV)
                .append(SvgImageUtil.toSafeHtml(svgImage, "face"))
                .toSafeHtml();
        getElement().setInnerSafeHtml(safeHtml);
    }
Used to decide whether to allow clicks to propagate up to the superclass
or container elements.
stroom-core-client-widget/src/main/java/stroom/widget/button/client/InlineSvgButton.java