This release includes 5.0.3 fixes and other small improvements, including another round of performance improvements. It will line up with includes WordPress 5.0.3 fixes but it doesn’t align with it completely and can be first tested as plugin version 4.8.

The goal of Gutenberg is to simplify the creation of rich pages and posts in WordPress by replacing old custom HTML, CSS, and shortcodes with native Blocks. The Gutenberg plugin is currently the main focus for the testing group and Gutenberg is the new editing experience in WordPress. To help test, please download gutenberg.zip from the releases page or use the button above, install/activate the plugin, and try testing any of the items listed below. You can also see other options for getting setup for testing in the handbook. When testing, use the latest stable release of WordPress (5.0.2) and the Gutenberg 4.8 plugin (download using the links above). All testing is welcome even if it’s just one or two items!

1. Open a large document and quickly type a short word. Typing should not feel slow, if it does please note the document size you tested. (12312)
2. Check that drag and drop works as expected when adding media before/after blocks and on the media placeholder. (12852)
3. Open the editor and try to drag an image that is larger than the max file upload limit. You should see a relevant error message. (10224)
4. Add a File block, upload a large file, click the Copy URL button. Make sure the URL copied does not start with “blob”. Throttle your connection speed if needed. (12499)
5. Add a gallery of images, set an alignment, convert the gallery into images and verify the alignment is preserved. (12242)
6. Create a post with multiple paragraphs, ensure you have a large number of plugins active that make the left hand menu long (e.g. 10 custom post types), publish or refresh, attempt to scroll to the end. (12644)
7. Add a Latest Posts block, add an extra class in Additional CSS Class box, make sure the date position does not change. (12725)
8. Add a Latest Posts block, click on Align Center, and check that the content centers as expected. (12306)
9. Add a short sentence to a paragraph block, enable dropcaps from block options, hover over the block and note the hover area is shown around the dropcap and content. (12177)
10. Create a classic post, insert an image with a caption AND link to the media file, publish the classic post, edit the post in the block editor, convert the classic block to blocks. There should not be a duplicate image. (12315)
11. Open any post, run this command in the console dispatch action command 'wp.data.dispatch('core/editor').lockPostSaving('lockName');' then click on “Update”. Update button should not do any action if it is locked. (11809)
12. If you use custom post types with taxonomies, ensure all taxonomies have show_in_rest, and check that you can see more than 10 taxonomies. (12971)
13. If you use custom posts types with 'publicly_queryable' => false, check that you can save the post without any problems. (12800)
14. For more, see issues in the 4.8 milestone.

If you find a new bug, please file it in gutenberg on GitHub. Thank you! Block developers: make sure to be aware of deprecations. Please join us in #core-test on WordPress Slack any time if you have questions about testing! #4-8, #call-for-testing, #gutenberg