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Make preload_link_tag work with images by nateberkopec · Pull Request #43088 · r...
source link: https://github.com/rails/rails/pull/43088
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Prior to this change, preload_link_tag with an image would generate a tag without an as attribute. If the as attribute doesn't get set, browsers tend to ignore the link tag (confirmed in Chrome), making the tag useless.
This change fixes the issue.
After a quick look at the valid values for as in a preload tag, I don't think there are any other ones missing that could be detected from the file's mime type or extension.
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