Blocks the page by adding a semitransparent white overlay on top of it.
Acest script nu ar trebui instalat direct. Aceasta este o bibliotecă pentru alte scripturi care este inclusă prin directiva meta a // @require https://update.greatest.deepsurf.us/scripts/468732/1205573/blockPage.js
Use "blockPage()" to block the page and "unblockPage()" to unblock it.