diff -urN v2/ezhtml.py v3/ezhtml.py
--- v2/ezhtml.py	2018-09-17 00:15:20.000000000 +0900
+++ v3/ezhtml.py	2018-09-17 20:15:22.000000000 +0900
@@ -28,15 +28,23 @@
 		return s
 	return cv_amp(o)
 
+def html_load(s):
+	# ...
+	return { 'html': { 'body': { 'p': 'to be continued' } } }
+
 if __name__ == "__main__":
 	b = nkf.get_stdin()
 	opt = nkf.guess(b)
+	html = nkf.dec( nkf.do_cmd('file - | grep -i html', b) ).strip()
 	u8 = nkf.cvt(b, '-u')
 	s = nkf.dec(u8)
 
-	o = yaml.load(s)
-
-	s = html_dump(o) + '\n'
+	if html:
+		o = html_load(s)
+		s = yaml.dump( o, default_flow_style=False )
+	else:
+		o = yaml.load(s)
+		s = html_dump(o) + '\n'
 
 	u8 = nkf.enc(s)
 	b = nkf.cvt(u8, opt)