function imageLoadError(img) { const fallbackImage = '/media/sites/cnn/cnn-fallback-image.jpg'; img.removeAttribute('onerror'); img.src = fallbackImage; let element = img.previousElementSibling; while (element && element.tagName === 'SOURCE') { element.srcset = fallbackImage; element = element.previousElementSibling; } } • Video 1:01 From John Nelson/Facebook

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3. function imageLoadError(img) { const fallbackImage = '/media/sites/cnn/cnn-fallback-image.jpg'; img.removeAttribute('onerror'); img.src = fallbackImage; let element = img.previousElementSibling; while (element && element.tagName === 'SOURCE') { element.srcset = fallbackImage; element = element.previousElementSibling; } } • Video 1:01 From John Nelson/Facebook