elisp libxml-parse-html-region return NIL -

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here elisp code (test url "http://httpbin.org/html")     (with-current-buffer (url-retrieve-synchronously my-url)     (goto-char (point-min))     (re-search-forward "^$")     (delete-region (point) (point-min))     (setq dom (libxml-parse-html-region (point-min) (point-max)))     (hoge--log-trace "current buffer content: %s" (buffer-string))     (hoge--log-trace "dom is: %s" dom)     )  parse html use elisp function "libxml-parse-html-region"  result is:  current buffer content:  <!doctype html> <html>   <head>   </head>   <body>       <h1>herman melville - moby-dick</h1>        <div>         <p>           availing himself ...         </p>       </div>   </body> </html> dom is: nil

as can see buffer has content, elisp function libxml-parse-html-region return nill , result dom object nil. why?


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