### Question:
Document extends Element { public OutputSettings outputSettings() { return outputSettings; } Document(String baseUri); static Document createShell(String baseUri); String location(); Element head(); Element body(); String title(); void title(String title); Element createElement(String tagName); Document normalise(); @Override String outerHtml(); @Override Element text(String text); @Override String nodeName(); void charset(Charset charset); Charset charset(); void updateMetaCharsetElement(boolean update); boolean updateMetaCharsetElement(); @Override Document clone(); OutputSettings outputSettings(); Document outputSettings(OutputSettings outputSettings); QuirksMode quirksMode(); Document quirksMode(QuirksMode quirksMode);  }### Answer:
@Test public void testXhtmlReferences() { Document doc = Jsoup.parse("&lt; &gt; &amp; &quot; &apos; &times;"); doc.outputSettings().escapeMode(Entities.EscapeMode.xhtml); assertEquals("&lt; &gt; &amp; \" ' ×", doc.body().html()); }
@Test public void testHtmlAndXmlSyntax() { String h = "<!DOCTYPE html><body><img async checked='checked' src='&<>\"'>&lt;&gt;&amp;&quot;<foo />bar"; Document doc = Jsoup.parse(h); doc.outputSettings().syntax(Syntax.html); assertEquals("<!doctype html>\n" + "<html>\n" + " <head></head>\n" + " <body>\n" + " <img async checked src=\"&amp;<>&quot;\">&lt;&gt;&amp;\"\n" + " <foo />bar\n" + " </body>\n" + "</html>", doc.html()); doc.outputSettings().syntax(Document.OutputSettings.Syntax.xml); assertEquals("<!DOCTYPE html>\n" + "<html>\n" + " <head></head>\n" + " <body>\n" + " <img async=\"\" checked=\"checked\" src=\"&amp;<>&quot;\" />&lt;&gt;&amp;\"\n" + " <foo />bar\n" + " </body>\n" + "</html>", doc.html()); }
@Test public void htmlParseDefaultsToHtmlOutputSyntax() { Document doc = Jsoup.parse("x"); assertEquals(Syntax.html, doc.outputSettings().syntax()); }
@Test public void testHtmlAppendable() { String htmlContent = "<html><head><title>Hello</title></head><body><p>One</p><p>Two</p></body></html>"; Document document = Jsoup.parse(htmlContent); OutputSettings outputSettings = new OutputSettings(); outputSettings.prettyPrint(false); document.outputSettings(outputSettings); assertEquals(htmlContent, document.html(new StringWriter()).toString()); }