Allowed changes during Drupal core release cycles
This policy explains what changes can be made to different core versions during the Drupal core release cycle.
Backport policy
Assigning a version to an issue
Change records
Getting started with adding a change record for Drupal core.
Continuous upgrades between major versions
The guidelines used to create a continuous upgrade path from the previous major release.
Core gates
Core changes must pass through a series of "gates" to ensure their quality is up to standards.
Criteria for evaluating proposed changes
Criteria for reviewing and approving proposed changes to Drupal core
Drupal core backend backwards compatibility and internal API policy
What parts of the Drupal codebase are considered stable and reliable APIs, and which are not
Drupal core frontend backwards compatibility (BC) policy
This document defines the backwards compatibility policy for the Drupal frontend (render arrays, themes, markup, CSS, and JavaScript).
Experimental modules and themes
Modules and themes that are in development but not quite stable yet
How to deal with a random test failure
What to do if you encounter a random test failure
How to deprecate
A list of what can be deprecated and how to do implement the deprecation.
How to deprecate and remove an extension
Module or theme deprecation and removal process
Set platform requirements
Criteria for setting platform requirements such as PHP and Database versions.
Supported browser approval
Guidelines for selecting the browsers supported.
