This CL provides a bunch of new parser tests, and updates the

sky/tests/parser/README.md

Index: sky/tests/parser/README.md
diff --git a/sky/tests/parser/README.md b/sky/tests/parser/README.md
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+The empty, cr, and utf16 tests don't import the test framework so they
+currently hang until timeout. Really they should just check that
+nothing crashes. For now they are disabled.
+
+We should also test the following (each line is its own test):
+
+```
+<
+<!
+<!-
+<!--
+<!---
+<!----
+<!---->
+<!----->
+<a
+<aa
+<a 
+<a a
+<a a=
+<a a=&
+<a a=&#
+<a a=&#x
+<a a=&#x1
+<a a=&#x1;
+<a a=&#1
+<a a=&#1;
+<a a=&a
+<a a=&a;
+<a a=&;
+<a a='
+<a a="
+<a a=a
+<a>
+<a >
+<a a>
+<a a=>
+<a a=&>
+<a a=&#>
+<a a=&#x>
+<a a=&#x1>
+<a a=&#x1;>
+<a a=&#1>
+<a a=&#1;>
+<a a=&a>
+<a a=&a;>
+<a a=&;>
+<a a=''>
+<a a="">
+<a a=a>
+<a a >
+<a a= >
+<a a=& >
+<a a=&# >
+<a a=&#x >
+<a a=&#x1 >
+<a a=&#x1; >
+<a a=&#1 >
+<a a=&#1; >
+<a a=&a >
+<a a=&a; >
+<a a=&; >
+<a a='' >
+<a a="" >
+<a a=a >
+</a
+</aa
+</a 
+</a a
+</a a=
+</a a=&
+</a a=&#
+</a a=&#x
+</a a=&#x1
+</a a=&#x1;
+</a a=&#1
+</a a=&#1;
+</a a=&a
+</a a=&a;
+</a a=&;
+</a a='
+</a a="
+</a a=a
+</a>
+</a >
+</a a>
+</a a=>
+</a a=&>
+</a a=&#>
+</a a=&#x>
+</a a=&#x1>
+</a a=&#x1;>
+</a a=&#1>
+</a a=&#1;>
+</a a=&a>
+</a a=&a;>
+</a a=&;>
+</a a=''>
+</a a="">
+</a a=a>
+</a a >
+</a a= >
+</a a=& >
+</a a=&# >
+</a a=&#x >
+</a a=&#x1 >
+</a a=&#x1; >
+</a a=&#1 >
+</a a=&#1; >
+</a a=&a >
+</a a=&a; >
+</a a=&; >
+</a a='' >
+</a a="" >
+</a a=a >
+a
+&
+&#
+&#x
+&#x1
+&#x1;
+&#1
+&#1;
+&a
+&a;
+&;
+```
+
+We should also test:
+
+- multiple elements per page
+- signature stuff
+- <t>