Ok: absolute URL

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Error: no src-tag

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Warn: no quotes (we don't insert them)

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A tag (alt), which should be skipped by imgsize

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Warn: whitespace

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Warn: whitespace and a newline

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Ok: relative URL

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Ok: also relative

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Don't overwrite an existing single width-tag
Imgsizer should calculate the height-tag

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Warn: A single existing height-tag
should be ignored and overwritten.

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Both tags given: Don't overwrite anything

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Paranoia ;-)

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A given relative width
the img should be skipped.

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Try a JPEG