when using lazyLoad with srcset, do not download the image twice #2738
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This is a fix for pull request #2681 by fozzleberry, titled "Lazy loading with srcset and sizes attributes"
The problem I was seeing was that the in-memory image used for triggering onload was only being loaded with src, not srcset and sizes, so it was making a different decision about which image size to use than the image in the DOM. Adding srcset and sizes to the in-memory image helps the browser make the same decision both times, and thus not download two different sizes of the same image.