lambdasoup
                                
                                
                                
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                        Add :has selector
Pretty much what the title says.
I have added a few test cases all of which pass with flying colours.
Let me know if anything needs to be done.
One note though: make test didn't seem to run my changes. I tested that by adding a bad variable name, but the command did not err out. So I ended up testing with dune exec ./test/performance/test.exe -w after tweaking the file location (google.html) to match the test path.
Please let me know if more needs to be done.