Browser Matrix
USPS customers use a broad range of browsers and devices to visit our site and we have adopted browser matrices to accommodate ‘average’ USPS.com users, specifically:
- IE/Internet Explorer*
- Edge
- Mozilla Firefox
- Safari
- Chrome
*Note: Microsoft is no longer supporting IE 10 (or earlier versions) and will soon phase out all IE support. USPS.com support of IE 10 and 11 will end on August 17, 2021. To take advantage of all features and functionality on USPS.com, we recommend that you use the latest version of any of the other supported browsers listed above.
Mobile Browser Matrix
USPS.com currently supports the current and recent versions of the most popular mobile operating systems and browsers:
- iOS
- iOS Safari
- Android
- Android Chrome
For any questions about how to apply the style guide, please email USPS Digital CCB.
JavaScript Libraries
USPS.com leverages Bootstrap and jQuery for form controls. In some cases, the default specifications are used, but often they are modified to fit the USPS.com brand or specific UI requirements.
The following JavaScript library versions are currently in use:
- Bootstrap: 4.3.1
- jQuery: 3.5.1
- jQuery UI: 1.12.1
Device Breakpoints
Mobile
- 320px — 767px
- @media only screen and (max-width: 767px) {...}
Tablet
- 768px — 991px
- @media only screen and (max-width: 991px) {...}
Desktop
- 992px and up
- @media only screen and (min-width: 992px) {...}
