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Leftovers from #1880: HTML import: images (data: URIs, cid:/http via a caller resolver, sized placeholders) #1898
Description
Leftovers from #1880 (PR #1897): minor review findings and plan items deferred by the loop.
- plan-alt (minor, plan v2 out of scope): Suite: draw an imported image placeholder's alt text inside its frame
- plan-size (minor, plan v2 out of scope): HTML import images: percentage sizes, max-width and floating (align/float) images
- plan-base (minor, plan v2 out of scope): HTML import images: and MHTML parts
- plan-fmt (minor, plan v2 out of scope): HTML import images: SVG/WebP, background-image,
/srcset
plan-alt
Out of scope in #1880's plan. An unresolved <img> with a size imports as a placeholder picture (a 1×1 grey PNG stretched to the size) whose wp:docPr descr is the alt text. Word shows that as the picture's Alt Text; the suite draws only the grey box. Draw the descr text inside the picture frame (clipped) so a mail with its images refused still shows "Company logo" etc.
plan-size
Out of scope in #1880's plan. Image sizing in the HTML import reads CSS/attribute lengths only: percentage widths/heights (width="100%", CSS width:50%) are ignored, max-width/max-height are not applied (only the body-width cap), and float / align=left|right images stay inline instead of becoming floating (anchored) pictures.
plan-base
Out of scope in #1880's plan. Relative <img src> values resolve against the page's own folder only: a <base href> in the page is ignored. MHTML (.mht/.mhtml, multipart/related with Content-Location/cid: parts) is not read, though it is what Word's "Single File Web Page" saves; its parts could feed the same image resolver.
plan-fmt
Out of scope in #1880's plan. Only PNG, JPEG, GIF and BMP image bytes are embedded by the HTML import; SVG (Word needs a PNG fallback beside asvg:svgBlip) and WebP become placeholders. CSS background-image, <picture>/<source> and srcset are not read.
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