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- HTML Purifier 4.9.x is a maintenance release, collecting a year
- of accumulated bug fixes plus a few new features. New features
- include support for min/max-width/height CSS, and rgba/hsl/hsla
- in color specifications. Major bugfixes include improvements
- in the Serializer cache to avoid chmod'ing directories, better
- entity decoding (we won't accidentally encode entities that occur
- in URLs) and rel="noopener" on links with target attributes,
- to prevent them from overwriting the original frame.
- 4.9.3 works around an infinite loop bug in PHP 7.1 with the opcode
- cache (and has one other, minor bugfix, avoiding using autoloading
- when testing for DOMDocument presence). If these bugs do not
- affect you, you do not need to upgrade.
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