You can then use data attribute with an equal sign. Like this: data-mdb-calendar-init="true"

calendar plugin get error on data-mdb-calendar-init

Severity Code Description Project File Line Suppression State Warning Validation (HTML5): This attribute name must be followed by an equal (=) sign and a value. If the value is in quotation marks, the quotation marks must match.

The calendar plugin and I am getting error for "data-mdb-calendar-init" Warning Validation (HTML5): This attribute name must be followed by an equal (=) sign

We need more information. What plugin do you mean? What exactly isn't working? Do you get any errors in the console? We also need information on how to reproduce this issue.