From Documentation
Since 9.0.0
Property:
org.zkoss.zul.css.flex
Applicable:globally in zk.xml via <library-property>
nested in a zul file via <custom-attributes>
Set to use CSS3 flex implementation in ZK Flex.
See ZK Flex for additional information.
Default: true
<component> <custom-attributes org.zkoss.zul.css.flex="true"/> ...
<library-property> <name>org.zkoss.zul.css.flex</name> <value>true</value> </library-property> ...
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