remove html literal operator

6 jobs for v2beta
Status Name Job ID Coverage
  Test
passed clang-c++11 #5207
Linux

00:02:15

passed clang-c++98 #5209
Linux

00:01:46

passed gcc-c++11 #5206
Linux

00:03:56

passed gcc-c++98 #5208
Linux

00:02:10

passed macos-c++11 #5210
Apple

00:02:21

passed macos-c++98 #5211
Apple

00:01:15