&western ndragstart="return false" error after use?-CodePudding

<body ondragstart="return false" style="background: # f0f9fd;">
But I also want to use this, I don't want to let others drag and drop me a label, request big help!
Tip:
Org. XML. Sax. SAXParseException: associated with the element type "a" attribute name "on" must be followed by the '=' character,
At com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException ErrorHandlerWrapper. Java: (203)
At com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError ErrorHandlerWrapper. Java: (177)
At com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError XMLErrorReporter. Java: (400)
At com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError XMLErrorReporter. Java: (327)
At com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError XMLScanner. Java: (1472)
At com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanAttribute XMLDocumentFragmentScannerImpl. Java: (1531)
At com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement XMLDocumentFragmentScannerImpl. Java: (1315)
At com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next XMLDocumentFragmentScannerImpl. Java: (2784)
At com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next XMLDocumentScannerImpl. Java: (602)
At com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument XMLDocumentFragmentScannerImpl. Java: (505)
At com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse XML11Configuration. Java: (842)
At com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse XML11Configuration. Java: (771)
At com.sun.org.apache.xerces.internal.parsers.XMLParser.parse XMLParser. Java: (141)
At com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse AbstractSAXParser. Java: (1213)
At com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse SAXParserImpl. Java: (643)
At com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse SAXParserImpl. Java: (327)
The at org. Thymeleaf. Templateparser. Xmlsax. AbstractNonValidatingSAXTemplateParser. DoParse (AbstractNonValidatingSAXTemplateParser. Java: 209)
The at org. Thymeleaf. Templateparser. Xmlsax. AbstractNonValidatingSAXTemplateParser. ParseTemplateUsingPool (AbstractNonValidatingSAXTemplateParser. Java: 134)
The at org. Thymeleaf. Templateparser. Xmlsax. AbstractNonValidatingSAXTemplateParser. ParseTemplate (AbstractNonValidatingSAXTemplateParser. Java: 116)
The at org. Thymeleaf. TemplateRepository. GetTemplate (TemplateRepository. Java: 278)
The at org. Thymeleaf. TemplateEngine. Process (TemplateEngine. Java: 1104)
The at org. Thymeleaf. TemplateEngine. Process (TemplateEngine. Java: 1060)
The at org. Thymeleaf. TemplateEngine. Process (TemplateEngine. Java: 1011)
The at org. Thymeleaf. Spring4. View. ThymeleafView. RenderFragment (ThymeleafView. Java: 335)
The at org. Thymeleaf. Spring4. View. ThymeleafView. Render (ThymeleafView. Java: 190)
The at org. Springframework. Web. Servlet. DispatcherServlet. Render (DispatcherServlet. Java: 1286)
The at org. Springframework. Web. Servlet. DispatcherServlet. ProcessDispatchResult (DispatcherServlet. Java: 1041)
The at org. Springframework. Web. Servlet. DispatcherServlet. DoDispatch (DispatcherServlet. Java: 984)
The at org. Springframework. Web. Servlet. DispatcherServlet. DoService (DispatcherServlet. Java: 901)
The at org. Springframework. Web. Servlet. FrameworkServlet. The processRequest (FrameworkServlet. Java: 970)
The at org. Springframework. Web. Servlet. FrameworkServlet. DoGet (FrameworkServlet. Java: 861)
The at javax.mail. Servlet. HTTP. HttpServlet. Service (HttpServlet. Java: 635)
At org. Springframework. Web. Servlet. FrameworkServlet. Service (846) FrameworkServlet. Java:
The at javax.mail. Servlet. HTTP. HttpServlet. Service (HttpServlet. Java: 742)
The at org. Apache. Catalina. Core. ApplicationFilterChain. InternalDoFilter (ApplicationFilterChain. Java: 231)
The at org. Apache. Catalina. Core. ApplicationFilterChain. DoFilter (ApplicationFilterChain. Java: 166)
At org, apache tomcat, websocket server WsFilter. DoFilter (WsFilter. Java: 52)
The at org. Apache. Catalina. Core. ApplicationFilterChain. InternalDoFilter (ApplicationFilterChain. Java: 193)
The at org. Apache. Catalina. Core. ApplicationFilterChain. DoFilter (ApplicationFilterChain. Java: 166)
The at org. Springframework. Web. Filter. RequestContextFilter. DoFilterInternal (RequestContextFilter. Java: 99)
The at org. Springframework. Web. Filter. OncePerRequestFilter. DoFilter (OncePerRequestFilter. Java: 107)
The at org. Apache. Catalina. Core. ApplicationFilterChain. InternalDoFilter (ApplicationFilterChain. Java: 193)
The at org. Apache. Catalina. Core. ApplicationFilterChain. DoFilter (ApplicationFilterChain. Java: 166)
The at org. Springframework. Web. Filter. HttpPutFormContentFilter. DoFilterInternal (HttpPutFormContentFilter. Java: 108)
The at org. Springframework. Web. Filter. OncePerRequestFilter. DoFilter (OncePerRequestFilter. Java: 107)
The at org. Apache. Catalina. Core. ApplicationFilterChain. InternalDoFilter (ApplicationFilterChain. Java: 193)
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