Translations:Parsing/Replacing Tidy/FAQ/17/en

Based on these tests, we identified several classes of markup errors that will render differently between the two. For one class of markup errors (self-closing tags that aren't valid in HTML5), we added a maintenance category that editors have already been using to fix up templates and pages. But, the other classes of markup errors are not easy to detect automatically at this time and editors' assistance is necessary to identify and fix them up.