| commit | author | age | ||
| 83c3f6 | 1 | Before opening: |
| SP | 2 | |
| 3 | - [Search for duplicate or closed issues](https://github.com/twbs/bootstrap/issues?utf8=%E2%9C%93&q=is%3Aissue) | |
| 4 | - [Validate](https://html5.validator.nu/) and [lint](https://github.com/twbs/bootlint#in-the-browser) any HTML to avoid common problems | |
| 5 | - Read the [contributing guidelines](https://github.com/twbs/bootstrap/blob/master/CONTRIBUTING.md) | |
| 6 | ||
| 7 | Bug reports must include: | |
| 8 | ||
| 9 | - Operating system and version (Windows, macOS, Android, iOS, Win10 Mobile) | |
| 10 | - Browser and version (Chrome, Firefox, Safari, IE, MS Edge, Opera 15+, Android Browser) | |
| 11 | - [Reduced test case](https://css-tricks.com/reduced-test-cases/) and suggested fix using [CodePen](https://codepen.io/) or [JS Bin](https://jsbin.com/) | |
