These values are supported for 'text' but not 'textarea'. Manually adding these as allowed parameters to HTMLTextAreaField.php and testing it out seems to work perfectly fine.
Description
Details
Event Timeline
Change 986654 had a related patch set uploaded (by Agent Isai; author: Agent Isai):
[mediawiki/core@REL1_41] Add 'minlength' and 'maxlength' support to HTMLTextArea
Change 988257 had a related patch set uploaded (by 沈澄心; author: Agent Isai):
[mediawiki/core@master] Add 'minlength' and 'maxlength' support to HTMLTextArea
Change 988257 abandoned by 沈澄心:
[mediawiki/core@master] Add 'minlength' and 'maxlength' support to HTMLTextArea
Reason:
Change 986653 had a related patch set uploaded (by 沈澄心; author: Agent Isai):
[mediawiki/core@master] Add 'minlength' and 'maxlength' support to HTMLTextAreaField
Change 986653 merged by jenkins-bot:
[mediawiki/core@master] Add 'maxlength' and 'minlength' support to HTMLTextAreaField
Change 1003826 had a related patch set uploaded (by Universal Omega; author: Agent Isai):
[mediawiki/core@REL1_41] Add 'maxlength' and 'minlength' support to HTMLTextAreaField
Change 1003826 merged by jenkins-bot:
[mediawiki/core@REL1_41] Add 'maxlength' and 'minlength' support to HTMLTextAreaField
Change #986654 abandoned by Reedy:
[mediawiki/core@REL1_41] Add 'minlength' and 'maxlength' support to HTMLTextArea
Reason:
https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1003826