This addition to the Javascript and text ensures a clear message to the
user of a Javascript-enabled browser that there is an issue with the
amount. Also, it prevents submission of the form until the amount is
correct.
A user with Javascript disabled can circumvent these validation steps;
however, the worst-case scenario is that they make a donation for less
than $120 that is categorized in Conservancy's internal system as a
Supporter donation, and we'll be adding internal checks to find that.
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