226721 2021-06-07 03:40:02 -0700 SVGSVGElement's currentView + useCurrentView are non-standard 2026-08-16 18:57:48 -0700 1 1 1 Unclassified WebKit SVG WebKit Local Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=260677 GoodFirstBug, InRadar, WPTImpact P2 Normal --- 191292 1 philip webkit-unassigned ahmad.saleem792 cdumez dino esprehn+autocc ews-watchlist fmalita gyuyoung.kim heycam karlcow kondapallykalyan pdr rbuis sabouhallawa schenney sergio webkit-bug-importer zimmermann oldest_to_newest 1767388 0 philip 2021-06-07 03:40:02 -0700 These two attributes on SVGSVGElement are gone from the spec: https://github.com/w3c/svgwg/commit/4c26fd36937a65192024208d85c144a21071b057 https://www.w3.org/Graphics/SVG/WG/track/actions/3800?changelog They were removed from Chromium here: https://bugs.chromium.org/p/chromium/issues/detail?id=629445 Gecko doesn't have currentView, but the bug for removing useCurrentView is here: https://bugzilla.mozilla.org/show_bug.cgi?id=1174097 1767596 1 heycam 2021-06-07 16:22:27 -0700 (In reply to Philip Jägenstedt from comment #0) > Gecko doesn't have currentView, but the bug for removing useCurrentView is > here: > https://bugzilla.mozilla.org/show_bug.cgi?id=1174097 That has a patch I wrote 6 years ago and didn't land. :-) Anyway, yes these are a straightforward removal. 1769346 2 webkit-bug-importer 2021-06-14 03:40:15 -0700 <rdar://problem/79281167> 1900907 3 462585 rbuis 2022-09-24 10:04:14 -0700 Created attachment 462585 Patch 1937369 4 ahmad.saleem792 2023-02-28 05:20:59 -0800 https://wpt.fyi/results/svg/historical.html?label=experimental&label=master&aligned 1973358 5 ahmad.saleem792 2023-08-24 14:56:31 -0700 We have following as well: https://github.com/w3c/svgwg/issues/747 To revert these changes, I tried to do this PR: https://github.com/WebKit/WebKit/pull/13851 but now will look for input before proceeding. @Said - any input on above GitHub issue. 2240786 6 481069 karlcow 2026-08-16 18:50:47 -0700 Created attachment 481069 testcase-probe.html 1. SVG 2 removed the SVGViewSpec interface and the currentView / useCurrentView properties in 2015. 2. Blink and Gecko removed them. 3. WebKit is the only engine that still exposes all three, and it fails the three WPT subtests that check for their absence. https://wpt.fyi/results/svg/historical.html?label=master&label=experimental&aligned&q=svgviewSpec%20 Nobody is implementing the revert that svgwg#747 asks for. https://github.com/w3c/svgwg/issues/747 The issue has been dormant since October 2019. The working group asked, aka "what real use case breaks?" and there was never an answer. * Deleting the two IDL lines (bug 226721) is genuinely two lines. * Deleting the SVGViewSpec class (bug 260677) is not, because WebKit uses that class as the live storage for the view-override state that the renderer reads. There is no useCounter because Chrome cannot count what it is not implementing. SVG 2 Removed: * The SVGViewSpec interface (the JavaScript object). * SVGSVGElement.currentView and SVGSVGElement.useCurrentView. * viewTarget on SVGViewElement, and zoomAndPan(...) from the fragment grammar. SVG 2 Kept (for now): * The SVGViewSpec grammar rule (a name in the fragment syntax description, not an object.) * The whole #svgView(...) feature, fully specified in §16.3.2. https://w3c.github.io/svgwg/svg2-draft/linking.html#SVGFragmentIdentifiersDefinitions * The <view> element, in §16.3.3. https://w3c.github.io/svgwg/svg2-draft/linking.html#ViewElement So MyDrawing.svg#svgView(viewBox(0,200,1000,1000)) is still a live, specified feature. What went away is the way to read the resulting view back out from script. 2240788 7 karlcow 2026-08-16 18:52:37 -0700 Blink: removed in 2016, class kept out of reach svg_svg_element.idl declares neither property. Removed via crbug 629445. svg_view_spec.h:36 still declares class SVGViewSpec final : public GarbageCollected<SVGViewSpec>. That marking only means Blink's memory manager owns the object's lifetime. It is not marked as something JavaScript can hold a reference to, and it has no .idl file, so no page can reach it. The parsing machinery survives; the API does not. Gecko: never had currentView; removed useCurrentView in 2022 dom/webidl/SVGSVGElement.webidl declares only currentScale and currentTranslate. No SVGViewSpec in any .webidl file at all. The fragment arguments live in an internal-only class, SVGView at dom/svg/SVGSVGElement.h:36, whose own comment says "Stores svgView arguments of SVG fragment identifiers." useCurrentView was removed on 2022-10-12. Mozilla bug 1174097, commit 2c05875c25de, r=emilio. That was heycam's patch from 2015 finally landing, seven years later. 2240789 8 karlcow 2026-08-16 18:55:08 -0700 The other part bug 260677 is not trivial. WebKit uses SVGViewSpec as the live storage for the view-override state. Blink and Gecko use a throwaway internal object for the same job. So in WebKit the class is not a leftover wrapper sitting on top of the real implementation. It is the real implementation, and it happens to carry a web-exposed name. 2240790 9 karlcow 2026-08-16 18:57:48 -0700 I think we should remove it and carry on with Ahmad PR. https://github.com/WebKit/WebKit/pull/13851 I will propose to close the issue on the SVG WG. 462585 2022-09-24 10:04:14 -0700 2022-09-24 11:52:54 -0700 Patch bug-226721-20220924180413.patch text/plain 2823 rbuis RnJvbSA2NDQ2NWQxZWM2NzZjOWVlZDg5NGIzZTk5NmE4OTgzYzI3NTQyZTFiIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBSb2IgQnVpcyA8cmJ1aXNAaWdhbGlhLmNvbT4KRGF0ZTogU2F0 LCAyNCBTZXAgMjAyMiAxODowMzozNCArMDEwMApTdWJqZWN0OiBbUEFUQ0hdIFNWR1NWR0VsZW1l bnQncyBjdXJyZW50VmlldyArIHVzZUN1cnJlbnRWaWV3IGFyZSBub24tc3RhbmRhcmQKIGh0dHBz Oi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMjY3MjEKClJldmlld2VkIGJ5IE5P Qk9EWSAoT09QUyEpLgoKV0lQLgoKKiBMYXlvdXRUZXN0cy9pbXBvcnRlZC93M2Mvd2ViLXBsYXRm b3JtLXRlc3RzL3N2Zy9oaXN0b3JpY2FsLWV4cGVjdGVkLnR4dDoKKiBTb3VyY2UvV2ViQ29yZS9z 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