In r251581, the list of computed CSS properties was changed to be autogenerated from 'CSSProperties.json'. One issue that arose from this was that `-webkit-text-decorations-in-effect` was no longer part of the `CSSComputedStyleDeclaration`, which caused a number of editing tests to fail, as that property is used for holding internal state related to various editing commands (e.g. `document.execCommand`). In order to get around this, `ComputedStyleExtractor::copyProperties()` was modified to instead copy _all_ CSS properties, regardless of whether they're part of the set of computed CSS properties. Unfortunately, this had a side effect of triggering a longstanding `LOG_ERROR` (added in r6178) when attempting to retrieve the value of certain CSS properties (e.g. `-internal-text-autosizing-status`). Since this path can be triggered by any arbitrary JavaScript (e.g. `window.getComputedStyle(document.body).getPropertyCSSValue("-internal-text-autosizing-status")`), it doesn't add much benefit to have this log, especially since the code itself is already annotated with comments/FIXMEs for CSS properties that don't have a computed value.
Created attachment 383023 [details] Patch
Comment on attachment 383023 [details] Patch Clearing flags on attachment: 383023 Committed r252176: <https://trac.webkit.org/changeset/252176>
All reviewed patches have been landed. Closing bug.
<rdar://problem/56973391>