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<!doctype html>
<img
data-desc="img (no src)"
data-narrow=""
data-wide=""
data-no-change>
<img src=""
data-desc="img (empty src)"
data-narrow=""
data-wide=""
data-no-change>
<img src="/images/broken.png?30-{{GET[id]}}"
data-desc="img (src only) broken image"
data-narrow="/images/broken.png?30-{{GET[id]}}"
data-wide="/images/broken.png?30-{{GET[id]}}"
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data-desc="img (src only) valid image"
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data-desc="img (srcset 1 cand) broken image"
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data-no-change>
<img srcset="/images/green-1x1.png?60-{{GET[id]}}"
data-desc="img (srcset 1 cand) valid image"
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data-wide="/images/green-1x1.png?60-{{GET[id]}}"
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<picture>
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<img src="/images/broken.png?71-{{GET[id]}}"
data-desc="picture: source (max-width:500px) broken image, img broken image"
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<picture>
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<img src="/images/green-2x2.png?81-{{GET[id]}}"
data-desc="picture: source (max-width:500px) broken image, img valid image"
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<picture>
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<img src="/images/broken.png?91-{{GET[id]}}"
data-desc="picture: source (max-width:500px) valid image, img broken image"
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<picture>
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<img src="/images/green-2x2.png?101-{{GET[id]}}"
data-desc="picture: source (max-width:500px) valid image, img valid image"
data-narrow="/images/green-1x1.png?100-{{GET[id]}}"
data-wide="/images/green-2x2.png?101-{{GET[id]}}">
</picture>
<picture>
<source media="(max-width:500px)" srcset="/images/green-1x1.png?110-{{GET[id]}}">
<img src="/images/green-1x1.png?110-{{GET[id]}}"
data-desc="picture: same URL in source (max-width:500px) and img"
data-narrow="/images/green-1x1.png?110-{{GET[id]}}"
data-wide="/images/green-1x1.png?110-{{GET[id]}}"
data-no-change>
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