function ImageLoadingAttributeTest::testImageLoadingAttribute

Tests that loading attribute is enabled for images.

File

core/modules/system/tests/src/Functional/Theme/ImageLoadingAttributeTest.php, line 29

Class

ImageLoadingAttributeTest

Tests lazy loading for images.

Namespace

Code

public function testImageLoadingAttribute() : void {
    $assert = $this->assertSession();
    // Get page under test.
    $this->drupalGet('image-lazy-load-test');
    // Loading attribute is added when image dimensions has been set.
    $assert->elementAttributeExists('css', '#with-dimensions img', 'loading');
    $assert->elementAttributeContains('css', '#with-dimensions img', 'loading', 'lazy');
    // Loading attribute with lazy default value can be overridden.
    $assert->elementAttributeContains('css', '#override-loading-attribute img', 'loading', 'eager');
    // Without image dimensions loading attribute is not generated.
    $element = $assert->elementExists('css', '#without-dimensions img');
    $this->assertFalse($element->hasAttribute('loading'));
}