16 Macworld • April 2020REVIEW
Advanced rules can be
set, though it requires
a fairly substantial
understanding of HTML
and related propertiesEach rule can block
a URL pattern, cookies
sent when loading a
given URL pattern,
and the display of a
CSS (Cascading Style
Sheet) element, where
CSS is used for overlay
boxes and similar
page elements. When
blocking URLs, the
rule can also specify whether everything from that
location is blocked or a particular kind of item is
blocked, like an image or a script.
You can click the Custom button in the 1Blocker
app in its upper-left corner, choose a category, then
click the +New Rule button in the lower-right corner
to add rules appropriate for that category. This
includes whitelisting, site URLs, cookies, and CSS
elements. You can choose to force a site to only
load via a secure https URL.
Whitelisting is a powerful tool to trust a site fully.
It bypasses any rule choices you’ve made, except
forcing all-https requests.