297455 2025-08-15 07:17:12 -0700 CSS dominant-baseline property should be inherited per SVG2 / CSS Inline 3 2026-04-06 19:21:15 -0700 1 1 1 Unclassified WebKit SVG Safari 18 Mac (Apple Silicon) macOS 15 NEW InRadar P2 Normal --- 311553 1 stephen karlcow karlcow sabouhallawa webkit-bug-importer zimmermann oldest_to_newest 2136773 0 stephen 2025-08-15 07:17:12 -0700 If a <text> element is given a y-position and the dominant baseline is set to middle, the y-attribute value is used to place the bottom of the text rather than its middle. Reproduction: https://codepen.io/sathomas/pen/EaVowqb 2138247 1 webkit-bug-importer 2025-08-22 07:18:24 -0700 <rdar://problem/158944151> 2197172 2 karlcow 2026-04-05 23:44:16 -0700 all the tests in SVG mentioning dominant-baseline are passing. https://wpt.fyi/results/svg?label=master&label=experimental&aligned&q=dominant-baseline But this is working. <text x="50" y="100" dominant-baseline="middle">Hello</text> So the issue is elsewhere. in SVG2 https://w3c.github.io/svgwg/svg2-draft/text.html#DominantBaselineProperty ========== This property is defined in the CSS Line Layout Module 3 specification. See 'dominant-baseline'. [css-inline-3] SVG 2 introduces some changes to the definition of this property. In particular: * The 'reset-size' value is no longer supported. Any change in font-size resets the dominant baseline table. * The 'use-script' and 'no-change' values are no longer supported. * The property is now inherited. (Behavior is effectively unchanged.) SVG uses the value of the dominant-baseline property to align glyphs relative to the ‘x’ and ‘y’ attributes. For the text-orientation value sideways, the auto value for dominant-baseline is alphabetic; however, for backwards compatibility, the glyphs should be aligned to the ‘x’ and ‘y’ attributes using the value central. ==== The issue is that tspan is not inheriting from text. That's the issue, but the spec says it should. 2197173 3 karlcow 2026-04-05 23:46:28 -0700 I also open Bug 311552 remove use-script, no-change, reset-size from dominant-baseline per spec 2197185 4 karlcow 2026-04-06 01:14:04 -0700 Fixing this test, create a regression that needs to be addressed first which has a kind of baseline baked-in for get*PositionOfChar --- /Users/karlcow/code/OpenSource/WebKitBuild/Debug/layout-test-results/imported/w3c/web-platform-tests/svg/text/scripted/getstartpositionofchar-dominant-baseline-expected.txt +++ /Users/karlcow/code/OpenSource/WebKitBuild/Debug/layout-test-results/imported/w3c/web-platform-tests/svg/text/scripted/getstartpositionofchar-dominant-baseline-actual.txt @@ -1,6 +1,6 @@ Test Test Test Test -PASS textPath: get*PositionOfChar().y should not depend on dominant-baseline -PASS tspan: get*PositionOfChar().y should not depend on dominant-baseline +FAIL textPath: get*PositionOfChar().y should not depend on dominant-baseline assert_equals: expected 95.556640625 but got 80 +FAIL tspan: get*PositionOfChar().y should not depend on dominant-baseline assert_equals: expected 115.556640625 but got 100 I need to fix it first. in Bug 311553 2197199 5 karlcow 2026-04-06 02:26:29 -0700 Pull request: https://github.com/WebKit/WebKit/pull/62107 2197203 6 karlcow 2026-04-06 02:31:27 -0700 This PR needs to be merged first https://github.com/WebKit/WebKit/pull/62106 2197205 7 478934 karlcow 2026-04-06 02:32:11 -0700 Created attachment 478934 testcase The testcase 7 illustrates the issue. 2197462 8 karlcow 2026-04-06 19:21:15 -0700 *** Bug 139258 has been marked as a duplicate of this bug. *** 478934 2026-04-06 02:32:11 -0700 2026-04-06 02:32:11 -0700 testcase test-dominant-baseline.html text/html 5113 karlcow PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KPG1ldGEgY2hhcnNldD0idXRmLTgiPgo8dGl0 bGU+QnVnIDI5NzQ1NSAtIFNWRyBkb21pbmFudC1iYXNlbGluZSBtaWRkbGUgd2l0aCB5IGF0dHJp YnV0ZTwvdGl0bGU+CjxzdHlsZT4KYm9keSB7IGZvbnQtZmFtaWx5OiBzeXN0ZW0tdWk7IG1hcmdp bjogMmVtOyB9CnN2ZyB7IGJvcmRlcjogMXB4IHNvbGlkICNjY2M7IGRpc3BsYXk6IGJsb2NrOyBt YXJnaW46IDAuNWVtIDA7IH0KLnBhc3MgeyBjb2xvcjogZ3JlZW47IGZvbnQtd2VpZ2h0OiBib2xk OyB9Ci5mYWlsIHsgY29sb3I6IHJlZDsgZm9udC13ZWlnaHQ6IGJvbGQ7IH0KPC9zdHlsZT4KPC9o ZWFkPgo8Ym9keT4KPGgxPkJ1ZyAyOTc0NTUg4oCUIGRvbWluYW50LWJhc2VsaW5lPSJtaWRkbGUi IGlnbm9yZWQgd2l0aCB5IGF0dHJpYnV0ZTwvaDE+CjxwPkVhY2ggdGVzdCBzaG93cyBhIGhvcml6 b250YWwgZ3JlZW4gbGluZSBhdCB0aGUgdGFyZ2V0IHkgcG9zaXRpb24uIFRoZSB0ZXh0CnNob3Vs ZCBiZSB2ZXJ0aWNhbGx5IGNlbnRlcmVkIG9uIHRoYXQgbGluZSB3aGVuIDxjb2RlPmRvbWluYW50 LWJhc2VsaW5lPSJtaWRkbGUiPC9jb2RlPgppcyBzZXQuPC9wPgoKPGgyPjEuIGRvbWluYW50LWJh c2VsaW5lPSJhdXRvIiAoZGVmYXVsdCkg4oCUIHRleHQgc2l0cyBvbiB0aGUgbGluZTwvaDI+Cjxz dmcgd2lkdGg9IjQwMCIgaGVpZ2h0PSIxMDAiIHZpZXdCb3g9IjAgMCA0MDAgMTAwIj4KICA8cmVj dCB3aWR0aD0iNDAwIiBoZWlnaHQ9IjEwMCIgZmlsbD0iI2Y4ZjhmOCIvPgogIDxsaW5lIHgxPSIw IiB5MT0iNTAiIHgyPSI0MDAiIHkyPSI1MCIgc3Ryb2tlPSIjMjdhZTYwIiBzdHJva2Utd2lkdGg9 IjEiLz4KICA8dGV4dCB4PSIxMCIgeT0iNTAiIGZvbnQtc2l6ZT0iMjQiIGRvbWluYW50LWJhc2Vs aW5lPSJhdXRvIj5hdXRvIOKAlCBiYXNlbGluZSBvbiBsaW5lPC90ZXh0Pgo8L3N2Zz4KCjxoMj4y LiBkb21pbmFudC1iYXNlbGluZT0ibWlkZGxlIiDigJQgdGV4dCBzaG91bGQgYmUgY2VudGVyZWQg b24gdGhlIGxpbmU8L2gyPgo8cD48c3BhbiBjbGFzcz0icGFzcyI+UEFTUzwvc3Bhbj4gaWYgdGhl IHRleHQgaXMgdmVydGljYWxseSBjZW50ZXJlZCBvbiB0aGUgZ3JlZW4gbGluZS4KPHNwYW4gY2xh c3M9ImZhaWwiPkZBSUw8L3NwYW4+IGlmIHRoZSB0ZXh0IHNpdHMgb24gdGhlIGxpbmUgKHNhbWUg YXMgYXV0bykuPC9wPgo8c3ZnIHdpZHRoPSI0MDAiIGhlaWdodD0iMTAwIiB2aWV3Qm94PSIwIDAg NDAwIDEwMCI+CiAgPHJlY3Qgd2lkdGg9IjQwMCIgaGVpZ2h0PSIxMDAiIGZpbGw9IiNmOGY4Zjgi Lz4KICA8bGluZSB4MT0iMCIgeTE9IjUwIiB4Mj0iNDAwIiB5Mj0iNTAiIHN0cm9rZT0iIzI3YWU2 MCIgc3Ryb2tlLXdpZHRoPSIxIi8+CiAgPHRleHQgeD0iMTAiIHk9IjUwIiBmb250LXNpemU9IjI0 IiBkb21pbmFudC1iYXNlbGluZT0ibWlkZGxlIj5taWRkbGUg4oCUIGNlbnRlcmVkIG9uIGxpbmU8 L3RleHQ+Cjwvc3ZnPgoKPGgyPjMuIGRvbWluYW50LWJhc2VsaW5lPSJjZW50cmFsIiDigJQgc2lt aWxhciB0byBtaWRkbGU8L2gyPgo8cD48c3BhbiBjbGFzcz0icGFzcyI+UEFTUzwvc3Bhbj4gaWYg Y2VudGVyZWQgb24gdGhlIGdyZWVuIGxpbmUuCjxzcGFuIGNsYXNzPSJmYWlsIj5GQUlMPC9zcGFu PiBpZiBzYW1lIGFzIGF1dG8uPC9wPgo8c3ZnIHdpZHRoPSI0MDAiIGhlaWdodD0iMTAwIiB2aWV3 Qm94PSIwIDAgNDAwIDEwMCI+CiAgPHJlY3Qgd2lkdGg9IjQwMCIgaGVpZ2h0PSIxMDAiIGZpbGw9 IiNmOGY4ZjgiLz4KICA8bGluZSB4MT0iMCIgeTE9IjUwIiB4Mj0iNDAwIiB5Mj0iNTAiIHN0cm9r ZT0iIzI3YWU2MCIgc3Ryb2tlLXdpZHRoPSIxIi8+CiAgPHRleHQgeD0iMTAiIHk9IjUwIiBmb250 LXNpemU9IjI0IiBkb21pbmFudC1iYXNlbGluZT0iY2VudHJhbCI+Y2VudHJhbCDigJQgY2VudGVy ZWQgb24gbGluZTwvdGV4dD4KPC9zdmc+Cgo8aDI+NC4gZG9taW5hbnQtYmFzZWxpbmU9Imhhbmdp bmciIOKAlCB0b3Agb2YgdGV4dCBvbiB0aGUgbGluZTwvaDI+CjxwPjxzcGFuIGNsYXNzPSJwYXNz Ij5QQVNTPC9zcGFuPiBpZiB0ZXh0IGhhbmdzIGJlbG93IHRoZSBncmVlbiBsaW5lLgo8c3BhbiBj bGFzcz0iZmFpbCI+RkFJTDwvc3Bhbj4gaWYgc2FtZSBhcyBhdXRvLjwvcD4KPHN2ZyB3aWR0aD0i NDAwIiBoZWlnaHQ9IjEwMCIgdmlld0JveD0iMCAwIDQwMCAxMDAiPgogIDxyZWN0IHdpZHRoPSI0 MDAiIGhlaWdodD0iMTAwIiBmaWxsPSIjZjhmOGY4Ii8+CiAgPGxpbmUgeDE9IjAiIHkxPSIzMCIg eDI9IjQwMCIgeTI9IjMwIiBzdHJva2U9IiMyN2FlNjAiIHN0cm9rZS13aWR0aD0iMSIvPgogIDx0 ZXh0IHg9IjEwIiB5PSIzMCIgZm9udC1zaXplPSIyNCIgZG9taW5hbnQtYmFzZWxpbmU9Imhhbmdp bmciPmhhbmdpbmcg4oCUIHRvcCBhdCBsaW5lPC90ZXh0Pgo8L3N2Zz4KCjxoMj41LiBkb21pbmFu dC1iYXNlbGluZT0idGV4dC10b3AiIOKAlCB0b3Agb2YgZW0gYm94IGF0IHRoZSBsaW5lPC9oMj4K PHN2ZyB3aWR0aD0iNDAwIiBoZWlnaHQ9IjEwMCIgdmlld0JveD0iMCAwIDQwMCAxMDAiPgogIDxy ZWN0IHdpZHRoPSI0MDAiIGhlaWdodD0iMTAwIiBmaWxsPSIjZjhmOGY4Ii8+CiAgPGxpbmUgeDE9 IjAiIHkxPSIzMCIgeDI9IjQwMCIgeTI9IjMwIiBzdHJva2U9IiMyN2FlNjAiIHN0cm9rZS13aWR0 aD0iMSIvPgogIDx0ZXh0IHg9IjEwIiB5PSIzMCIgZm9udC1zaXplPSIyNCIgZG9taW5hbnQtYmFz ZWxpbmU9InRleHQtdG9wIj50ZXh0LXRvcCDigJQgZW0gdG9wIGF0IGxpbmU8L3RleHQ+Cjwvc3Zn PgoKPGgyPjYuIFNpZGUtYnktc2lkZSBjb21wYXJpc29uIGF0IHNhbWUgeTwvaDI+CjxwPkFsbCB0 aHJlZSB0ZXh0cyBoYXZlIDxjb2RlPnk9IjUwIjwvY29kZT4uIFRoZXkgc2hvdWxkIGFwcGVhciBh dApkaWZmZXJlbnQgdmVydGljYWwgcG9zaXRpb25zIHJlbGF0aXZlIHRvIHRoZSBncmVlbiBsaW5l LjwvcD4KPHA+PHNwYW4gY2xhc3M9InBhc3MiPlBBU1M8L3NwYW4+IGlmIGFsbCB0aHJlZSBhcmUg YXQgdmlzaWJseSBkaWZmZXJlbnQgaGVpZ2h0cy4KPHNwYW4gY2xhc3M9ImZhaWwiPkZBSUw8L3Nw YW4+IGlmIHRoZXkgYWxsIHNpdCBhdCB0aGUgc2FtZSBwb3NpdGlvbi48L3A+Cjxzdmcgd2lkdGg9 IjYwMCIgaGVpZ2h0PSIxMDAiIHZpZXdCb3g9IjAgMCA2MDAgMTAwIj4KICA8cmVjdCB3aWR0aD0i NjAwIiBoZWlnaHQ9IjEwMCIgZmlsbD0iI2Y4ZjhmOCIvPgogIDxsaW5lIHgxPSIwIiB5MT0iNTAi IHgyPSI2MDAiIHkyPSI1MCIgc3Ryb2tlPSIjMjdhZTYwIiBzdHJva2Utd2lkdGg9IjEiLz4KICA8 dGV4dCB4PSIxMCIgIHk9IjUwIiBmb250LXNpemU9IjIwIiBmaWxsPSIjMmMzZTUwIiBkb21pbmFu dC1iYXNlbGluZT0iYXV0byI+YXV0bzwvdGV4dD4KICA8dGV4dCB4PSIyMDAiIHk9IjUwIiBmb250 LXNpemU9IjIwIiBmaWxsPSIjZTc0YzNjIiBkb21pbmFudC1iYXNlbGluZT0ibWlkZGxlIj5taWRk bGU8L3RleHQ+CiAgPHRleHQgeD0iNDAwIiB5PSI1MCIgZm9udC1zaXplPSIyMCIgZmlsbD0iIzI5 ODBiOSIgZG9taW5hbnQtYmFzZWxpbmU9ImhhbmdpbmciPmhhbmdpbmc8L3RleHQ+Cjwvc3ZnPgoK PGgyPjcuIE9yaWdpbmFsIGJ1ZyByZXByb2R1Y3Rpb246IHRzcGFuIGluc2lkZSB0ZXh0IHdpdGgg Y2xpcFBhdGg8L2gyPgo8cD5UaGUgdGV4dCBpcyBpbnNpZGUgYSA8Y29kZT4mbHQ7dHNwYW4mZ3Q7 PC9jb2RlPiB3aXRoaW4gPGNvZGU+Jmx0O3RleHQgZG9taW5hbnQtYmFzZWxpbmU9Im1pZGRsZSIg eT0iMzgiJmd0OzwvY29kZT4uClRoZSBjbGlwUGF0aCBjbGlwcyB0byB5PTIwLi44MC4gV2l0aCAz NnB4IGZvbnQgYW5kIG1pZGRsZSBiYXNlbGluZSBhdCB5PTM4LAp0aGUgdGV4dCBzaG91bGQgYmUg ZnVsbHkgdmlzaWJsZSAoMThweCBhYm92ZSArIDE4cHggYmVsb3cgPSB5PTIwIHRvIHk9NTYpLjwv cD4KPHA+PHNwYW4gY2xhc3M9InBhc3MiPlBBU1M8L3NwYW4+IGlmICJURVhUIiBpcyBmdWxseSB2 aXNpYmxlIHdpdGhpbiB0aGUgYm94Lgo8c3BhbiBjbGFzcz0iZmFpbCI+RkFJTDwvc3Bhbj4gaWYg dGhlIHRvcCBvZiAiVEVYVCIgaXMgY2xpcHBlZCAodGV4dCBwb3NpdGlvbmVkIHRvbyBoaWdoKS48 L3A+Cjxzdmcgd2lkdGg9IjEwMHB4IiBoZWlnaHQ9IjEwMHB4IiBzdHlsZT0iYm9yZGVyOiAxcHgg c29saWQgYmxhY2siPgogIDxkZWZzPgogICAgPGNsaXBQYXRoIGlkPSJjbGlwLWFyZWEiPgogICAg ICA8cmVjdCB4PSIwIiB5PSIyMCIgd2lkdGg9IjEwMCIgaGVpZ2h0PSI2MCI+PC9yZWN0PgogICAg PC9jbGlwUGF0aD4KICA8L2RlZnM+CiAgPGcgc3R5bGU9ImNsaXAtcGF0aDogdXJsKCNjbGlwLWFy ZWEpIj4KICAgIDx0ZXh0IHg9IjAiIHk9IjM4cHgiIGRvbWluYW50LWJhc2VsaW5lPSJtaWRkbGUi IHN0eWxlPSJmb250LXNpemU6IDM2cHgiPgogICAgICA8dHNwYW4+VEVYVDwvdHNwYW4+CiAgICA8 L3RleHQ+CiAgPC9nPgo8L3N2Zz4KCjxoMj44LiBTYW1lIGFzIDcgYnV0IHdpdGhvdXQgdHNwYW4g KGNvbnRyb2wpPC9oMj4KPHA+U2FtZSBzZXR1cCBidXQgdGV4dCBkaXJlY3RseSBpbnNpZGUgPGNv ZGU+Jmx0O3RleHQmZ3Q7PC9jb2RlPiwgbm8gPGNvZGU+Jmx0O3RzcGFuJmd0OzwvY29kZT4uCklm IHRoaXMgcGFzc2VzIGJ1dCB0ZXN0IDcgZmFpbHMsIHRoZSBidWcgaXMgaW4gaG93IDxjb2RlPmRv bWluYW50LWJhc2VsaW5lPC9jb2RlPgppbmhlcml0cyB0byBvciBpcyBhcHBsaWVkIHdpdGhpbiA8 Y29kZT4mbHQ7dHNwYW4mZ3Q7PC9jb2RlPi48L3A+Cjxzdmcgd2lkdGg9IjEwMHB4IiBoZWlnaHQ9 IjEwMHB4IiBzdHlsZT0iYm9yZGVyOiAxcHggc29saWQgYmxhY2siPgogIDxkZWZzPgogICAgPGNs aXBQYXRoIGlkPSJjbGlwLWFyZWEyIj4KICAgICAgPHJlY3QgeD0iMCIgeT0iMjAiIHdpZHRoPSIx MDAiIGhlaWdodD0iNjAiPjwvcmVjdD4KICAgIDwvY2xpcFBhdGg+CiAgPC9kZWZzPgogIDxnIHN0 eWxlPSJjbGlwLXBhdGg6IHVybCgjY2xpcC1hcmVhMikiPgogICAgPHRleHQgeD0iMCIgeT0iMzhw eCIgZG9taW5hbnQtYmFzZWxpbmU9Im1pZGRsZSIgc3R5bGU9ImZvbnQtc2l6ZTogMzZweCI+VEVY VDwvdGV4dD4KICA8L2c+Cjwvc3ZnPgoKPC9ib2R5Pgo8L2h0bWw+Cg==