. Internal change
==========================
+4.10.0, released 2018-02-22
+# PHP 5.3 is no longer officially supported by HTML Purifier
+ (we did not specifically break support, but we are no longer
+ testing on PHP 5.3)
+! Relative CSS length units are now supported
+- A few PHP 7.2 compatibility fixes, thanks John Flatness
+ <john@zerocrates.org>
+- Improve portability with old versions of libxml which don't
+ support accessing the data of a node
+- IDNA2008 is now used for converting domains to ASCII, fixing
+ some rather strange bugs with international domains
+- Fix race condition resulting in E_WARNING when creating
+ directories with Serializer
+
+4.9.3, released 2017-06-02
+- Workaround PHP 7.1 infinite loop when opcode cache is enabled.
+ Thanks @Xiphin (#134, #135)
+- Don't use autoloader when testing for DOMDocument. Hypothetically,
+ this could cause your install to start using DirectLex if you had
+ previously been monkeypatching in a custom, autoloaded implementation
+ of DOMDocument. Don't do that. Thanks @Izumi-kun (#130)
+
4.9.2, released 2017-03-12
- Fixes PHP 5.3 compatibility
- Fix breakage when decoding decimal entities. Thanks @rybakit (#129)