fix: clip each highlighted element by its own scroll containers - #3483
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fix: clip each highlighted element by its own scroll containers#3483chuckcarpenter wants to merge 1 commit into
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`positionModal` clipped every highlighted element against a single scroll parent, the one derived from `step.target`. Any element in `extraHighlights` that lived in a different scroll container was therefore clamped against a rect it never intersects, so `_getVisibleHeight` returned a height of 0 and the overlay cut out a degenerate, invisible rect. The same single scroll parent was also applied to the containment check, so two elements in different containers could both clamp to zero height at the same clamped `y`, making `isContained` true and suppressing the extra highlight outright. Each highlighted element now resolves its own scroll containers, and `_getVisibleHeight` intersects against all of them rather than only the nearest. Walking the chain is required, not incidental: resolving per element while still clipping at a single level would regress nested layouts, where an extra inside an inner scroll container that is itself scrolled out of an outer one measures as fully visible against the inner container and cuts a hole in the overlay where nothing is on screen. Resolving per element also forced a second correction. DOM ancestry is not the clipping chain: a `fixed` element is laid out against the viewport, and an `absolute` element is cropped only from its containing block upwards, so a scrollable ancestor below that block paints it without cropping it. The walk now derives the containing block from each ancestor's computed `position` and skips ancestors that do not crop the element. Without this, resolving a chain for every highlight unconditionally would have cost an absolutely positioned dropdown its opening entirely whenever the panel it is nested in scrolled away -- a visible highlight becoming invisible. `offsetParent` would be the conventional way to find the containing block; it is unimplemented in happy-dom, so the unit tests could not exercise it and computed `position` is used instead. Rendering changes in four ways, all of them corrections: - An extra highlight in a different scroll container from the target is now cut out where it actually is, instead of collapsing to an invisible rect. - An extra highlight scrolled out of its own container now clips to zero height; previously it was clipped by the target's container instead. - A highlight, the target included, inside nested scroll containers is now clipped by all of them. Previously only the nearest applied, so a highlight scrolled out of an outer container still cut a hole in the overlay. This reaches past the reported bug, but per-element resolution without it would turn that latent flaw into a live one. - A highlight whose position takes it outside a scrollable DOM ancestor is cut out where it is painted rather than clamped to that ancestor. For the target this corrects existing behavior; for extra highlights it was mostly latent, since nothing clipped them at all unless the target happened to have a scroll parent. The chain is memoized per element per step in a `WeakMap` that is reset in `_cleanupStepEventListeners`, because the containment check is O(n^2) over the highlights and runs on every animation frame, while each walk costs one `window.getComputedStyle` call per ancestor. A highlight moved into a different scroll container mid-step keeps its memoized chain until the next `show()` -- the same once-per-step contract the target already had in `_styleForStep`. The fifth positional parameter is kept and renamed `scrollParent` -> `targetScrollParent`. It is still the target's own nearest scroll parent and is still applied to `targetElement` only; callers of the publicly typed `Tour.modal` are unaffected, since parameter names are not part of a function's structural type. Clipping remains y-axis only, and the walk still stops at shadow-DOM and iframe document boundaries. Transformed and filtered ancestors, which establish a containing block for `fixed` descendants, are not accounted for. All three are pre-existing and out of scope. Fixes #3344 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe modal overlay now resolves complete scroll-parent chains for the target and each extra highlight. Geometry intersects all applicable clipping containers. Tests and documentation cover nested, independent, fixed, and absolute positioning cases. ChangesOverlay clipping
Estimated code review effort: 3 (Moderate) | ~25 minutes Mergeability Score: 🔵 Low · up to Highlights inside containers using overflow-y: hidden may still be clipped incorrectly, causing the overlay hole to extend beyond the visible content or disappear. The PR is otherwise mergeable with explicit owner follow-up to include these containers in clipping detection. Sequence Diagram(s)sequenceDiagram
participant setupForStep
participant positionModal
participant getScrollParentChain
participant ScrollContainers
setupForStep->>getScrollParentChain: Resolve target and extra-highlight chains
setupForStep->>positionModal: Pass targetScrollParent and extraHighlights
positionModal->>getScrollParentChain: Resolve each highlight chain
getScrollParentChain->>ScrollContainers: Inspect overflow and positioning context
positionModal->>ScrollContainers: Intersect element bounds with clipping chain
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In `@shepherd.js/src/components/shepherd-modal.ts`:
- Around line 263-271: Update _isScrollable to remove the overflowY !== 'hidden'
exclusion, while retaining the overflowY !== 'visible' and dimension checks so
elements with hidden vertical overflow are treated as clipping ancestors.
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Fixes #3344.
The bug
positionModalclipped every highlighted element against a single scroll parent — the one derived fromstep.target. AnextraHighlightselement living in a different scroll container was clamped against a rect it never intersects, so_getVisibleHeightreturned height 0 and the overlay cut a degenerate, invisible hole. The same single scroll parent was applied to the containment check, so two elements in different containers could both clamp to zero at the samey, makingisContainedtrue and suppressing the extra outright.Each element now resolves its own chain of scroll containers, and
_getVisibleHeightintersects against all of them rather than only the nearest.DOM ancestry is not the clipping chain
Resolving per element forces a second correction. A
fixedelement is laid out against the viewport, and anabsoluteelement is cropped only from its containing block upwards — a scrollable ancestor below that block paints it without cropping it. So the walk cannot just followparentElement.On
mainthis was mostly latent, because nothing clipped extras at all unless the target happened to have a scroll parent. Resolving a chain for every element unconditionally makes it live: an absolutely positioned dropdown nested in a panel that has scrolled away loses its overlay opening entirely.The walk therefore derives the containing block from each ancestor's computed
positionand skips ancestors that don't crop the element.Why not
offsetParent, which is the conventional way to find a containing block: happy-dom does not implement it and returnsundefined. Code built on it would treat every absolutely positioned element as unclipped, pass the whole unit suite, and behave differently in a browser. Computedpositionis supported and gives the same answer.Testing
618 lines of new unit coverage, including four cases pinning the containing-block behavior. Mutation-tested — each of these turns the suite red:
absoluteelements exempted from clipping (over-broad)fixedno longer special-casedisContainedreverted to the target's scroll parentstypes:check/ build all cleandist.test:cy:ciservesdistwithout building, so a stale bundle silently reports a meaningless passScope and risk
Semver patch. The only signature change is renaming positional parameter 5 to
targetScrollParent; parameter names aren't part of a function's structural type, so callers of the publicly typedTour.modalare unaffected.The commit message enumerates all four rendering changes, including the one that reaches past the reported bug — highlights inside nested scroll containers are now clipped by all of them, where previously only the nearest applied.
Known limits, all pre-existing: clipping is y-axis only, the walk stops at shadow-DOM and iframe document boundaries, and transformed or filtered ancestors — which establish a containing block for
fixeddescendants — are not accounted for.🤖 Generated with Claude Code