Read Articles Without Distracting Ads or Sidebars
Safari Reader mode allows you to focus on content. It can be activated by touching or clicking the icon in the Search/URL bar in Safari (Mac, iPhone, iPad).
Or, on a Mac keyboard, use the shortcut Command+Shift+R.
If the icon above is not visible, the site does not support Safari Reader. (Most do!)
This site does support it. So try it now.
[Image courtesy of the iPad User Guide for iOS 9.3.]