[wp-trac] [WordPress Trac] #56930: Block themes: improve omitting lazy-loading attribute on first content image/iframe

[WordPress Trac]

#56930: Block themes: improve omitting lazy-loading attribute on first content
image/iframe
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 Reporter:  adamsilverstein           |       Owner:  flixos90
     Type:  defect (bug)              |      Status:  assigned
 Priority:  normal                    |   Milestone:  6.2
Component:  Media                     |     Version:  5.9
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  performance
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Comment (by antonvlasenko):

 == Test Report

 Patch tested: https://github.com/WordPress/wordpress-develop/pull/3560

 === Environment
 * OS: macOS 13.1
 * Web Server: Apache 2
 * PHP: 8.1.14
 * WordPress: 6.2-alpha-54642-src
 * Browser: Safari 16.2
 * Theme: Twenty Twenty-Three
 * No Active Plugins

 The test steps are taken from https://github.com/WordPress/wordpress-
 develop/pull/3560 's desription.
 === Steps
 1. Activate the `Twenty Twenty-Three` theme.
 2. Create a post with 2 `core/image` blocks.
 3. On the same post, set a featured image. Save the post.
 4. Go to the Site Editor and edit the `Header` and the `Footer` template
 parts.
 5. Add 1 `core/image` block to each of the template part and save them.

 === Actual Results
 1. Open the post on FE.
 2. ✅ Out of 2 images that were added on step 2 (see `Steps` above), the
 first image does not have a loading="lazy" attribute, while the second
 does have it.
 3. Open home page.
 4. ✅ The featured image does not have a `loading="lazy"` attribute.
 5. ❌🐞The image that was placed in the `Header` does have a
 `loading="lazy"`. Please see the screenshot below:
 [[Image(https://cldup.com/ckEdnrnSIy.png)]]
 6. ✅The image that was placed in the `Footer` does have a
 `loading="lazy"`.

 === Expected Results
 - The image that was placed in the `Header` must not have a
 `loading="lazy"`. This should be fixed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/56930#comment:36>
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