The need for clearfix hacks Show archive.org snapshot has been greatly reduced since we could layout with Flexbox or CSS Grid.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

Read more Show archive.org snapshot

However, when you do need a clearfix, there's no reason to use a hack anymore. You can just give the clearing container display: flow-root Show archive.org snapshot .

This is supported by all browsers except IE11 Show archive.org snapshot .