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module Banzai
module Filter
# HTML filter that moves the value of image `src` attributes to `data-src`
# so they can be lazy loaded.
class ImageLazyLoadFilter < HTML::Pipeline::Filter
def call
doc.xpath('descendant-or-self::img').each do |img|
img['class'] ||= '' << 'lazy'
img['data-src'] = img['src']
img['src'] = LazyImageTagHelper.placeholder_image
end
doc
end
end
end
end
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