diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index fd63e5e2e5312e..34b8153af9ce26 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -2,16 +2,16 @@
 https://github.com/WordPress/gutenberg/blob/trunk/CONTRIBUTING.md -->
 
 ## What?
-<!-- In a few words, what is the PR actually doing? -->
+<!-- In a few words, describe what this PR does. -->
 
 ## Why?
 <!-- Why is this PR necessary? What problem is it solving? Reference any existing previous issue(s) or PR(s), but please add a short summary here, too -->
 
 ## How?
-<!-- How is your PR addressing the issue at hand? What are the implementation details? -->
+<!-- How is your PR address the problem or requirement? What are the implementation details? -->
 
 ## Testing Instructions
-<!-- Please include step by step instructions on how to test this PR. -->
+<!-- Please include step-by-step instructions on how to test this PR. -->
 <!-- 1. Open a post or page. -->
 <!-- 2. Insert a heading block. -->
 <!-- 3. etc. -->
@@ -20,3 +20,7 @@ https://github.com/WordPress/gutenberg/blob/trunk/CONTRIBUTING.md -->
 <!-- How can you test the changes by using the keyboard only? Please note, this is required for PRs that change the user interface (UI). This ensures the PR can be tested for any possible accessibility regressions. -->
 
 ## Screenshots or screencast <!-- if applicable -->
+
+<!-- AUTO-GENERATED-WORDPRESS-PLAYGROUND-LINK -->
+<!-- Generates a test link to WordPress Playground. Please do not remove these comments. -->
+<!-- end: AUTO-GENERATED-WORDPRESS-PLAYGROUND-LINK -->
diff --git a/.github/workflows/php-changes-detection.yml b/.github/workflows/php-changes-detection.yml
index 7e80157d0caf7c..6196f6810d2cec 100644
--- a/.github/workflows/php-changes-detection.yml
+++ b/.github/workflows/php-changes-detection.yml
@@ -1,13 +1,13 @@
 name: OPTIONAL - Confirm if PHP changes require backporting to WordPress Core
 
 on:
-    pull_request:
+  pull_request_target:
         types: [opened, synchronize]
 jobs:
     detect_php_changes:
         name: Detect PHP changes
         runs-on: ubuntu-latest
-        if: ${{ github.repository == 'WordPress/gutenberg' || github.event_name == 'pull_request' }}
+        if: ${{ github.repository == 'WordPress/gutenberg' || github.event_name == 'pull_request_target' }}
         steps:
             - name: Check out code
               uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
@@ -41,7 +41,7 @@ jobs:
               uses: peter-evans/find-comment@v2
               id: find-comment
               with:
-                  issue-number: ${{ github.event.pull_request.number }}
+                  issue-number: ${{ github.event.number }}
                   comment-author: 'github-actions[bot]'
                   body-includes: '<!-- pr-contains-php-changes -->'
 
@@ -49,7 +49,7 @@ jobs:
               if: steps.find-comment.outputs.comment-id == '' && steps.changed-files-php.outputs.any_changed == 'true'
               uses: peter-evans/create-or-update-comment@v3
               with:
-                  issue-number: ${{ github.event.pull_request.number }}
+                  issue-number: ${{ github.event.number }}
                   body: |
                       <!-- pr-contains-php-changes -->
                       This pull request has changed or added PHP files. Please confirm whether these changes need to be synced to WordPress Core, and therefore featured in the next release of WordPress.
@@ -70,7 +70,7 @@ jobs:
               uses: peter-evans/create-or-update-comment@v3
               with:
                   comment-id: ${{ steps.find-comment.outputs.comment-id }}
-                  issue-number: ${{ github.event.pull_request.number }}
+                  issue-number: ${{ github.event.number }}
                   edit-mode: replace
                   body: |
                       <!-- pr-contains-php-changes -->
@@ -92,7 +92,7 @@ jobs:
               uses: peter-evans/create-or-update-comment@v3
               with:
                   comment-id: ${{ steps.find-comment.outputs.comment-id }}
-                  issue-number: ${{ github.event.pull_request.number }}
+                  issue-number: ${{ github.event.number }}
                   edit-mode: replace
                   body: |
                       <!-- pr-contains-php-changes -->
diff --git a/.github/workflows/pull-request-playground-comment.yml b/.github/workflows/pull-request-playground-comment.yml
new file mode 100644
index 00000000000000..f5794f9da5fe60
--- /dev/null
+++ b/.github/workflows/pull-request-playground-comment.yml
@@ -0,0 +1,69 @@
+# Leaves a comment on a pull request with a link to test the changes in a WordPress Playground instance.
+name: OPTIONAL - Comment on a pull request with Playground details
+
+on:
+  pull_request_target:
+    types:
+      - opened
+
+jobs:
+  test_using_wordpress_playground:
+    name: Test using WordPress Playground
+    runs-on: ubuntu-latest
+    permissions:
+        issues: write
+    if: ${{ github.repository  == 'WordPress/gutenberg' || github.event_name == 'pull_request_target' }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Update PR Description
+        uses: actions/github-script@v6
+        with:
+          script: |
+            // Extract information about the pull request
+            const prNumber = github.event.number;
+
+            // Fetch the current PR description
+            const currentDescription = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: prNumber,
+            }).then(response => response.data.body);
+
+            // Define the start and end comments
+            const startComment = '<!-- AUTO-GENERATED-WORDPRESS-PLAYGROUND-LINK -->';
+            const endComment = '<!-- end: AUTO-GENERATED-WORDPRESS-PLAYGROUND-LINK -->;
+
+            // Find the positions of the start and end comments
+            const startIndex = currentDescription.indexOf(startComment);
+            const endIndex = currentDescription.indexOf(endComment);
+
+            // Check if both start and end comments are present
+            if (startIndex !== -1 && endIndex !== -1) {
+              // Extract the content between the start and end comments
+              const placeholderContent = currentDescription.slice(startIndex + startComment.length, endIndex);
+
+              // Replace the content with your updated content
+              const newContent = `## Test this pull request with WordPress Playground
+              | :arrow_forward: **[Click here to load this PR into WordPress Playground](https://playground.wordpress.net/gutenberg.html?pr=56964)** |
+              | ------------- |
+
+              > [!TIP]
+              > _WordPress Playground uses the latest build of Gutenberg from this pull request. If your changes are not reflected in WordPress Playground , it's likely that the most recent build isn't complete or has failed. Check the [build workflow runs to be sure](https://github.com/WordPress/gutenberg/actions/workflows/build-plugin-zip.yml)._
+
+              Read more about [WordPress Playground](https://developer.wordpress.org/playground/) and its [limitations](https://wordpress.github.io/wordpress-playground/limitations/).
+              `;
+
+              const newDescription = currentDescription.replace(`${startComment}${placeholderContent}${endComment}`, `${startComment}${newContent}${endComment}`);
+
+              // Update PR description using GitHub API
+              await github.rest.pulls.update({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                pull_number: prNumber,
+                body: newDescription,
+              });
+            } else {
+              console.log("Start or end comment not found in the PR description.");
+            }
diff --git a/lib/demo.php b/lib/demo.php
index 11272050bf4c2e..5d33d62775ddb8 100644
--- a/lib/demo.php
+++ b/lib/demo.php
@@ -61,4 +61,5 @@ function gutenberg_default_demo_title( $title ) {
 
 	return $title;
 }
+
 add_filter( 'default_title', 'gutenberg_default_demo_title' );