--- breadcrumbs: - - /for-testers - For Testers - - /for-testers/bug-reporting-guidelines - Bug Life Cycle and Reporting Guidelines page_name: chromium-bug-labels title: Chromium Bug Labels ---

Label Allowed values Description
Type-value | `Bug` | `Bug-Regression` | `Bug-Security` | `Compat` | `Feature` | `Launch` | The issue type. An issue can only have one type.
Pri-value | `0 to 3` | The priority. An issue can only have one priority value. `0` is most urgent; `3` is least urgent.
OS-value | `All` | `Chrome` | `Linux` | `Mac` | `Windows` | The operating system(s) on which the bug occurs.
M-value | `27, 28, 29` | A release milestone before which we want to resolve the issue. An issue can only be assigned to one milestone† . `Mstone-X` is 'no milestone' (doesn't apply or not blocking any milestone). | † Except for security bugs. For those, the additional milestones denote branches that the bug should be merged to once fixed. See the severity guidelines.
Cr-value | Blink | Internals | Platform | UI-Shell | UI-Browser == Browser | Cr-OS-Hardware | Cr-OS-Kernel | Cr-OS-Systems | The product category to which an issue belongs. A bug can belong to multiple categories. |  |
| Cr-Blink |  | HTML, CSS, Javascript, and HTML5 features |
| Cr-Internals |  | Ugly guts, networking, IPC, storage backend, installer, etc |  |
| Cr-Platform |  | Developer Platform and Tools (Ext, AppsV2, NaCl, DevTools) |  |
| Cr-UI-Shell |  | Chrome OS Shell & Window Manager |  |
| Cr-UI-Browser |  | Browser related features (e.g. bookmarks, omnibox, etc...) |  |
| Cr-OS-Hardware |  | Chrome OS hardware related issues |  |
| Cr-OS-Kernel |  | Chrome OS kernel level issues |  |
| Cr-OS-Systems |  | Chrome OS system level issues |  |

Restrict-View-EditIssue - Used for security bugs to make a bug visible only to project members and the reporter.
Some other labels include: * Needs-Reduction: this bug requires a reduced test case. See . * Cr-UI-Internationalization: Internationalization issues (font selection and fallback, right-to-left display issues, IME, etc.) * Cr-UI-Localization: Translation issues * Type-Bug-Regression: Features that worked in prior releases and are now broken. These should be Pri-1. Component and Labels are created in the system via