19094 2008-05-15 17:08:24 -0700 offsetTop is wrong in cell <td> 2008-08-04 21:10:26 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED FIXED P1 Major --- 1 jsgoupil webkit-unassigned bdakin hyatt kruepl mitz oldest_to_newest 80581 0 jsgoupil 2008-05-15 17:08:24 -0700 When you have a cell that specifies its height, the offsetTop will be based on where the text will be written. It should be based where the TD starts. The workaround is to set the vertical-align: top to the TD. We tried with the latest version of Safari3.1.1(527.17) on Windows2003 and the night build on MAC. This is the HTML <html> <head> <script type="text/javascript"> function loaded() { alert("Offset of the TD: " + document.getElementById("thetd").offsetLeft + "X" + document.getElementById("thetd").offsetTop); } </script> </head> <body onload="loaded()" id="body"> <table style="background-color: orange;"><tr style="background-color: blue;"><td id="thetd" style="/*vertical-align:top;*/width: 100px; height: 500px;background-color: red"></td></tr></table> </body> </html> 87702 1 22620 kruepl 2008-08-02 15:59:12 -0700 Created attachment 22620 patch that corrects offsetTop for table cells 87703 2 kruepl 2008-08-02 16:12:51 -0700 This bug hit me when I wanted to extract table cell coordinates (latest SVN, OSX 10.5.4). Quite strangely, offsetTop lies intentionally: RenderTableCell.h, line100: // Lie about position to outside observers. virtual int yPos() const { return m_y + m_topExtra; } My patch corrects the lie by subtracting the borderTopExtra again. It breaks the regression, fast/dom/Element/offsetTop-table-cell.html explicitly asks for wrong values. I think this test is just wrong and should also be patched. 87719 3 22623 kruepl 2008-08-03 05:58:12 -0700 Created attachment 22623 patch that corrects offsetTop for table cells with test I created a patch for offsetTop, updated and extended the appropriate test. I also created a changelog entry. Hope this meets all requirements, the bug seems to have been present for eight years now... 87746 4 eric 2008-08-04 01:36:47 -0700 Beth is the right person to review this. 87786 5 bdakin 2008-08-04 12:36:15 -0700 I have a feeling that there is a reason offsetTop lied intentionally. I don't know why it was coded that way originally though. I am cc-ing Hyatt because he might have more information about that. But I am very worried about this change, especially considering the test and the comment. 87787 6 22623 hyatt 2008-08-04 12:44:44 -0700 Comment on attachment 22623 patch that corrects offsetTop for table cells with test This looks good actually. r=me. 87788 7 hyatt 2008-08-04 12:45:08 -0700 offsetTop is lying unintentionally because it used yPos(). 87793 8 mitz 2008-08-04 13:27:39 -0700 The isTableCell() check is an unnecessary virtual method call, because borderTopExtra() is 0 for anything else. If I land this patch, I will just remove it. 87808 9 kruepl 2008-08-04 16:31:49 -0700 Fair enough. And you are right, lying was yPos()'s intention, not offsetTop's. 87830 10 mitz 2008-08-04 21:10:26 -0700 Landed in <http://trac.webkit.org/changeset/35551>. 22620 2008-08-02 15:59:12 -0700 2008-08-03 05:58:12 -0700 patch that corrects offsetTop for table cells offsetTop-cells-patch.txt text/plain 603 kruepl SW5kZXg6IFdlYktpdC9XZWJDb3JlL3JlbmRlcmluZy9SZW5kZXJPYmplY3QuY3BwCj09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT0KLS0tIFdlYktpdC9XZWJDb3JlL3JlbmRlcmluZy9SZW5kZXJPYmplY3QuY3BwCShyZXZpc2lv biAzNTQyMCkKKysrIFdlYktpdC9XZWJDb3JlL3JlbmRlcmluZy9SZW5kZXJPYmplY3QuY3BwCSh3 b3JraW5nIGNvcHkpCkBAIC01MzEsNiArNTMxLDggQEAKICAgICBpZiAoIW9mZnNldFBhcikKICAg ICAgICAgcmV0dXJuIDA7CiAgICAgaW50IHkgPSB5UG9zKCkgLSBvZmZzZXRQYXItPmJvcmRlclRv cCgpOworICAgIGlmIChpc1RhYmxlQ2VsbCgpKQorICAgICAgICB5IC09IGJvcmRlclRvcEV4dHJh KCk7IC8vIFRhYmxlIGNlbGxzIGxpZSBhYm91dCB0aGVpciBwb3NpdGlvbiwgdGhpcyBjb3JyZWN0 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