Both the Go translator and the V8 runtime escaped " by prepending \,
which XPath 1.0 doesn't accept (its string literals have no escape
syntax). A `text:` value containing a quote produced malformed XPath
that chromedp/document.evaluate rejected.
Use the standard concat() composition: when the value contains both
' and ", split on " and join with `, '"', ` so each fragment is
wrapped in single or double quotes individually.
The previous cssEscape only handled " and \, leaving newlines/control
chars to break out of attribute string literals. Delegate to the
platform CSS.escape per CSSOM spec.
The `tag` selector branch returned the bare value through cssEscape,
which doesn't prevent pseudo-classes (`*:hover`) from injecting into
the surrounding selector. Add a positive whitelist; values that don't
match a tag-name pattern collapse to a never-matching `:not(*)`.
Also switch class selectors to `[class~="..."]` to remove the only
identifier-context use of cssEscape.
Web has no swipe gesture, so swipes dispatched pointer events into empty
divs. Make swipe() and the swipes builtin no-op. For PressKey, replace
the always-"back" choice with a random pick from {enter, tab, escape,
up, down, left, right} - keys that have real semantics in a browser.
V8-side runtime previously returned null when weighted picked a
generator that returned [] (page-gated), causing 80%+ of ticks on
narrow routes to emit no action and no post-screenshot. Now retries
up to 16x like goja, and the taps/swipes builtins query the live DOM
for clickable elements / dispatch random swipes instead of returning
null.
web-runtime.ts installs globalThis.__sanderling__ with extractor / action
registries, plus __sanderlingExtractors__ + __sanderlingNextAction__
globals. BundleWeb composes user spec + runtime under esbuild's
PlatformBrowser into one IIFE.
pj