Placeholder images described once and drawn two ways, so the preview, the raster and the SVG are the same picture. The label is measured and made to fit, and the quality slider only appears where quality does something.
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Caption a picture with text that is measured, wrapped and kept inside the frame. The preview canvas is the exported file, pixel for pixel.
Turn one image into a full icon set, including a real multi-size favicon.ico read back from its own bytes before it is offered. Names the resampling filter, states what a square crop discarded, and decodes every PNG again to confirm its size.
Turn an image into a data URL whose payload is decoded again and compared byte for byte with the file, with the media type taken from the file's own signature rather than its extension and the size cost of embedding stated in full.