2c2
< index f68274ddc6..c4ee725bdf 100644
---
> index 7a8dcb56c4..d42e4beda7 100644
24c24
< index abe7693f98..5e4896b1ba 100644
---
> index 02fa4cd0f1..06d2188501 100644
27c27,36
< @@ -417,7 +417,16 @@ public function provider() {
---
> @@ -133,7 +133,7 @@ protected function setUp(): void {
>      $basic_html_editor_with_media_embed->setSettings($settings);
>      $basic_html_editor_with_media_embed->save();
>  
> -    $new_value = str_replace('<img src alt height width data-entity-type data-entity-uuid data-align data-caption>', '<img src alt height width data-*>', $current_value);
> +    $new_value = str_replace('<img src alt loading height width data-entity-type data-entity-uuid data-align data-caption>', '<img src alt height width data-* loading>', $current_value);
>      $basic_html_format_with_any_data_attr = $basic_html_format;
>      $basic_html_format_with_any_data_attr['name'] .= ' (with any data-* attribute on images)';
>      $basic_html_format_with_any_data_attr['format'] = 'basic_html_with_any_data_attr';
> @@ -431,7 +431,16 @@ public function provider() {
45c54
< @@ -432,13 +441,13 @@ public function provider() {
---
> @@ -446,13 +455,13 @@ public function provider() {
61c70
< @@ -452,13 +461,13 @@ public function provider() {
---
> @@ -466,13 +475,13 @@ public function provider() {
77c86
< @@ -469,10 +478,10 @@ public function provider() {
---
> @@ -483,10 +492,10 @@ public function provider() {
90c99
< @@ -488,7 +497,7 @@ public function provider() {
---
> @@ -503,7 +512,7 @@ public function provider() {
99c108
< @@ -507,7 +516,15 @@ public function provider() {
---
> @@ -519,7 +528,14 @@ public function provider() {
108c117,118
< +              ['<img loading>']),
---
> +              ['<img loading>'],
> +            ),
110,112c120
< +          'ckeditor5_heading' => $basic_html_test_case['expected_ckeditor5_settings']['plugins']['ckeditor5_heading'],
< +          'ckeditor5_language' => $basic_html_test_case['expected_ckeditor5_settings']['plugins']['ckeditor5_language'],
< +        ],
---
> +        ] + $basic_html_test_case['expected_ckeditor5_settings']['plugins'],
116c124
< @@ -537,7 +554,7 @@ public function provider() {
---
> @@ -549,7 +565,7 @@ public function provider() {
119c127
<            'The following plugins were enabled to support specific attributes that are allowed by this text format: <em class="placeholder">Alignment ( for tag: &lt;p&gt; to support: class with value(s):  text-align-center, text-align-justify), Align center ( for tag: &lt;p&gt; to support: class with value(s):  text-align-center), Justify ( for tag: &lt;p&gt; to support: class with value(s):  text-align-justify)</em>.',
---
>            'The following plugins were enabled to support specific attributes that are allowed by this text format: <em class="placeholder">Alignment ( for tag: &lt;p&gt; to support: class with value(s):  text-align-center, text-align-justify)</em>.',
125c133,155
< @@ -556,7 +573,10 @@ public function provider() {
---
> @@ -564,12 +580,19 @@ public function provider() {
>              array_slice($basic_html_test_case['expected_ckeditor5_settings']['toolbar']['items'], 10),
>            ),
>          ],
> -        'plugins' => $basic_html_test_case['expected_ckeditor5_settings']['plugins'],
> +        'plugins' => [
> +          'ckeditor5_sourceEditing' => [
> +            'allowed_tags' => array_merge(
> +              $basic_html_test_case['expected_ckeditor5_settings']['plugins']['ckeditor5_sourceEditing']['allowed_tags'],
> +              ['<img loading>'],
> +            ),
> +          ],
> +        ] + $basic_html_test_case['expected_ckeditor5_settings']['plugins'],
>        ],
>        'expected_superset' => $basic_html_test_case['expected_superset'],
>        'expected_fundamental_compatibility_violations' => $basic_html_test_case['expected_fundamental_compatibility_violations'],
>        'expected_messages' => array_merge($basic_html_test_case['expected_messages'], [
> -        "This format's HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported by this text format, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: &lt;a hreflang&gt; &lt;blockquote cite&gt; &lt;ul type&gt; &lt;ol start type&gt; &lt;h2 id&gt; &lt;h3 id&gt; &lt;h4 id&gt; &lt;h5 id&gt; &lt;h6 id&gt;.",
> +        "This format's HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported by this text format, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: &lt;a hreflang&gt; &lt;blockquote cite&gt; &lt;ul type&gt; &lt;ol start type&gt; &lt;h2 id&gt; &lt;h3 id&gt; &lt;h4 id&gt; &lt;h5 id&gt; &lt;h6 id&gt; &lt;img loading&gt;.",
>        ]),
>      ];
>  
> @@ -582,7 +605,7 @@ public function provider() {
129,133c159,160
< -              ['<drupal-media data-caption>'],
< +              [
< +                '<img loading>',
< +                '<drupal-media data-caption>',
< +              ],
---
> -              ['<img data-*>'],
> +              ['<img data-* loading>'],
137,138c164
< @@ -564,7 +584,7 @@ public function provider() {
<        'expected_superset' => $basic_html_test_case['expected_superset'],
---
> @@ -591,7 +614,7 @@ public function provider() {
140,143c166,170
<        'expected_messages' => array_merge($basic_html_test_case['expected_messages'], [
< -        "This format's HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported by this text format, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: &lt;a hreflang&gt; &lt;blockquote cite&gt; &lt;ul type&gt; &lt;ol start type&gt; &lt;h2 id&gt; &lt;h3 id&gt; &lt;h4 id&gt; &lt;h5 id&gt; &lt;h6 id&gt; &lt;drupal-media data-caption&gt;.",
< +        "This format's HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported by this text format, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: &lt;a hreflang&gt; &lt;blockquote cite&gt; &lt;ul type&gt; &lt;ol start type&gt; &lt;h2 id&gt; &lt;h3 id&gt; &lt;h4 id&gt; &lt;h5 id&gt; &lt;h6 id&gt; &lt;img loading&gt; &lt;drupal-media data-caption&gt;.",
<        ]),
---
>        'expected_messages' => array_merge($basic_html_test_case['expected_messages'],
>          [
> -          'This format\'s HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported by this text format, the following were added to the Source Editing plugin\'s <em>Manually editable HTML tags</em>: &lt;a hreflang&gt; &lt;blockquote cite&gt; &lt;ul type&gt; &lt;ol start type&gt; &lt;h2 id&gt; &lt;h3 id&gt; &lt;h4 id&gt; &lt;h5 id&gt; &lt;h6 id&gt; &lt;img data-*&gt;.',
> +          'This format\'s HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported by this text format, the following were added to the Source Editing plugin\'s <em>Manually editable HTML tags</em>: &lt;a hreflang&gt; &lt;blockquote cite&gt; &lt;ul type&gt; &lt;ol start type&gt; &lt;h2 id&gt; &lt;h3 id&gt; &lt;h4 id&gt; &lt;h5 id&gt; &lt;h6 id&gt; &lt;img data-* loading&gt;.',
>          ]),