DRV1650-SR-EMBED-URL-RUNTIME-ORIGIN. The Driver copied
`research-map-plus-grid/research-map-plus-grid/index.html` from a page at
http://127.0.0.1:5192/, a link that works on no other site.
resolveShareUrl's tier 1 returns its input VERBATIM, correctly: a host handing over a
whole url has already decided. So a composite that BUILDS a tier-1 url takes on tier 2's
job, and both of mine wrote the same thing:
base ? base + '/' + leaf : leaf
On any host where the tree root cannot be derived from the script url — a dev server, an
ESM build, a tree served from a path that does not match `<name>/<name>.js` — base is ''
and the else branch hands tier 1 a bare relative path, which it then returns unresolved.
★ IT LOOKS RIGHT IN THE ONE PLACE ANYONE CHECKS. A relative share link WORKS WHEN
CLICKED, because the browser resolves it against the page you copied it from. It is the
EMBED that breaks — an <iframe src="…"> on a partner's page resolves against THEIRS — so
the failure is invisible exactly where it is tested and visible only where it ships.
research-map-plus-grid.vue:174 even documents the requirement ("It MUST be absolute,
which is the non-obvious part") four lines above the branch that violates it.
absoluteEmbedUrl() is tier 2's resolution made available to tier-1 builders: the
configured base when known, otherwise resolved against document.baseURI, which yields the
runtime origin. Never relative in a browser. The ladder is unchanged; only its last rung
is.
The gate has both arms, because either alone would rot: the RESOLVER must be absolute
with no base (the failing case, not the passing one), and no plugin may rebuild the
`: leaf` fallback. Negative-tested: removing the origin fallback, and re-introducing the
ternary in a plugin, each turn it red.
"Copy link didn't work" is most likely the same defect rather than a second one —
ShareButton's copy already falls back from navigator.clipboard to execCommand for
insecure contexts, so the copy almost certainly succeeded and produced a useless URL. If
it still fails after this, it is a separate bug and needs a browser to see.
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