WebKit Igalia Periodical #75

Add new ChildChange types for moveBefore(). This addresses issues with the in-progress moveBefore() implementation where scripts would sometimes execute erroneously.

Added alpha channel support to color input choosers.

Fixed Service Worker static routes on non-Apple ports.

Added a WebsitePolicies:upgrade-to-https-policy property. When enabled this policy will automatically try using HTTPS even for HTTP websites (excluding localhost or IPs). The policy can be configured either to allow automatically falling back to HTTP if that fails, or to consider all HTTPS failures fatal for the best security.

Fixed SVG text being rasterized for the wrong resolution in zoomed standalone SVG documents in the Layer-Based SVG Engine (LBSE). vector-effect: non-scaling-stroke on <text> no longer comes out too thick, and the resulting metrics match the legacy SVG engine.

Fixed viewport clipping in the Layer-Based SVG Engine (LBSE), where a nested <svg> or a <marker> applied its viewport clip even when its content already fitted inside, and since that clip is not pixel-snapped its edge could fall between two device pixels and cut into whatever was drawn right at the viewport border. Painting now skips a clip that removes nothing, which eliminates a class of subtle pixel differences against the legacy SVG engine.

Fixed opacity animations not damaging descendant layers in the GTK and WPE ports, where a descendant that paints outside its parent's bounds kept its stale pixels on screen. The mask-specific damage handling was generalized into a single group-property path shared by opacity, filters, mask blend modes and replicas, which now damages the layer plus the overlap region of its whole subtree.

Added a cycle-analysis subcommand to webkit-sysprof, which draws every frame cycle of a capture as a bar of cells colored by the mark covering that moment on the main thread, showing whether a slow frame stalled on layout, a long timer or rasterization instead of only reporting that it was slow.

Removed redundant text updates for the text children of elements using display: contents, which previously got one on every style resolution regardless of whether their style actually changed. This removes dozens of useless updates per style recalculation in Web Component applications, where every <slot> uses display: contents.

Fixed tile image caching in the Skia compositor by regenerating the cached SkImage whenever a a tile's contents are updated and by adding a texture release callback that keeps the texture valid for as long as the image references it.

Switched video DMA-BUF buffers to Skia promise images in the Skia compositor, so the texture backing a video frame is only created at the point Skia actually draws it, which works for these buffers because the underlying DMABufBuffer can be kept alive until the promise image is released.

Fixed a hang in the Layer-Based SVG Engine (LBSE) when two SVG <pattern> elements reference each other through href, or one references itself: collecting the inherited pattern attributes now remembers which patterns it has already visited, the same cycle detection that gradients have always had. The walk also resolves every reference in the tree scope of the pattern it started from, so a pattern referenced from inside a shadow tree now inherits the right attributes.

Skipped anchor-positioning bookkeeping during style resolution when a document uses no anchor positioning at all, avoiding two hash lookups per styled element.

Cached the SVG viewport size used to resolve lengths in the Layer-Based SVG Engine (LBSE), instead of recomputing the nearest <svg> element's view box rectangle once per shape per frame. The viewport is invariant across a flush and identical for every shape under the same <svg>, so caching removes redundant work.

Removed the code path for GPU rendering without Deferred Display Lists (DDL) in the Skia compositor, so accelerated painting always records into a display list and no longer needs to create GL contexts on worker threads.

Fixed red and blue appearing swapped in non-accelerated video with the Skia compositor, by allocating the video frame's BitmapTexture with the BGRA layout flag and applying that flag when the buffer is turned into a Skia image.

Bumped the GTK and WPE developer SDK from v9 to v11, bringing GStreamer 1.28.5, sparkle-cdm 2026.2 and libsoup 3.7.2. Be sure to update your local wkdev-sdk container using wkdev-update to make sure your development environment matches what the CI is testing.