Using Cutting Edge Technology for No Good Reason

It can be very tempting to use the newest technology. But if you put something on your website that is not widely supported by the browsers that visit your site you could risk losing customers rather than gaining them. When you use advanced technology (such as new versions of CSS or HTML), you should use it sparingly and only for elements that are not critical to the page as a whole.

sparingly
控えめに、慎重に

use special effects sparingly
特殊効果を控えめに使う

Water the seeds sparingly until the first sprout appears.
芽が出るまで、種に控えめに水をやります。