144710 2015-05-06 14:25:19 -0700 Scroll-snap point produces strange 'default' snap offset vector 2015-05-06 15:53:05 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED INVALID https://bugs.webkit.org/show_bug.cgi?id=144647 P2 Normal --- 1 bfulgham bfulgham bfulgham simon.fraser oldest_to_newest 1092317 0 bfulgham 2015-05-06 14:25:19 -0700 When we have scroll-snap point markup that specifies a horizontal snap range, but not a vertical, we get a default value of "{0, 15}". Example: .horizontalGallery { width: 300px; height: 300px; overflow-y: hidden; overflow-x: auto; -webkit-overflow-scrolling: touch; -webkit-scroll-snap-points-x: repeat(100%); -webkit-scroll-snap-type: mandatory; } This produces snap points as follows: horizontal = { 0, 300, 600, 900, 1200, 1500 }, vertical = { 0, 15 } I would expect to see either no snap points, or snap points for the two scroll extrema (i.e., vertical = { 0, 1500 } 1092318 1 bfulgham 2015-05-06 14:29:17 -0700 We enter the 'updateFromStyle' helper function in AxisScrollSnapOffsets.cpp with no vertical offset values. These are being set as the default positions: 1. We always append 0 when we have a scrollable area. 2. We always append the value of 'scroll{Width|Height}' - 'view{Width|Height}' In the test case 'scroll-snap-coordinates-borders.html', we somehow have a scrollable area that is 15 pixels larger than the view area. Could this be due to scrollbars? 1092375 2 bfulgham 2015-05-06 15:52:30 -0700 Measuring the pixels on a screenshot shows that the horizontal scrollbar is 15 pixels high, which is why we appear to have a vertical scrollable area of 15 pixels. I think this is working correctly. 1092376 3 252534 bfulgham 2015-05-06 15:53:05 -0700 Created attachment 252534 Screenshot showing horizontal scrollbar 252534 2015-05-06 15:53:05 -0700 2015-05-06 15:53:05 -0700 Screenshot showing horizontal scrollbar Screen Shot 2015-05-06 at 3.49.02 PM.png image/png 5772 bfulgham iVBORw0KGgoAAAANSUhEUgAAASwAAAE8CAYAAAB6q4zuAAAAAXNSR0IArs4c6QAAAZ1pVFh0WE1M OmNvbS5hZG9iZS54bXAAAAAAADx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6 eG1wdGs9IlhNUCBDb3JlIDUuNC4wIj4KICAgPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3 LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4KICAgICAgPHJkZjpEZXNjcmlwdGlv biByZGY6YWJvdXQ9IiIKICAgICAgICAgICAgeG1sbnM6ZXhpZj0iaHR0cDovL25zLmFkb2JlLmNv bS9leGlmLzEuMC8iPgogICAgICAgICA8ZXhpZjpQaXhlbFhEaW1lbnNpb24+MzAwPC9leGlmOlBp eGVsWERpbWVuc2lvbj4KICAgICAgICAgPGV4aWY6UGl4ZWxZRGltZW5zaW9uPjMxNjwvZXhpZjpQ aXhlbFlEaW1lbnNpb24+CiAgICAgIDwvcmRmOkRlc2NyaXB0aW9uPgogICA8L3JkZjpSREY+Cjwv eDp4bXBtZXRhPgp0mkfTAAAUnUlEQVR4Ae3cd4hc1RvG8bMxdsXexV6wIyqKLavYo0Ys2CsIdixg wRLxD0FQVKwosf1jCaKJRsW6iGJHURQ7ih3svZ/feY/e6+xkns3sqj8ezPfCZmfvO+WdzzvzzLl3 xLT55pvnAw88MDfbXXfdleeYY478yy+/NLvytddem1NK+dFHH637Ntpoo3ziiSe29fvuu6/WX3zx xXzjjTfm7bbbLt98883157TTTqu1O+64o17/4osvzgsssED+6aef2tvHhS233DIff/zx7b7p06fn gYGB/Nprr9V9Dz74YL7uuuvaeveFK664Ii+22GLt7uuvv74+brPjkUceqX9/9NFHza72948//pgX WmihfOutt7b7vvjii/r4nT2ttdZa7fOO2xx77LH1+p999llecskl2+ccz32eeebJBxxwQK2///77 9bGnTZvW3n9cuOGGG/LCCy/c7vv+++/r9e6555667+CDD8577713W48L22+/fV566aXbfYODg/mY Y45p/15//fXzYYcdVv8O46OPPrqtdV/oNYtdd901n3XWWe1zmTBhQp577rnzb7/9lt9+++3aXzOT eD3E6yL2N1v00zxmP66zmtMOO+xQX58///xzfYhXX321eSh+z4YC48obK5U3ennd/bE988wzaYkl lkjjx49vdqVNN920Xn7hhRfq7xIkady4cW19q622SnPNNVd66KGH0lNPPZVWWGGFtPrqq9efffbZ Jz377LNpiy22qNePxyuBVa/f3kGPCxMnTkwrrrhiuvrqq2u1BGnac889e1zzj13RU/yoLR4ztvIm nukqb7zxRvrqq6/SMsss09ZKkKQ11lgjNc85CocffngqYZR+/fXXdPfdd6fdd9+9Xv+ll15K8bya 5xy/H3vssTR58uRaj1psiy66aP3d7z/h1tlT3G6zzTZLH3/8cf2Jv0s4pdtuuy2VD5j01ltv1bmU D4f6PEvop9122y2u1nPrNYuY39prr90+l4suuig9/vjjqbw30iKLLJLKh1n9O+4wXjcxo/jptfXr 2nnb7jmVD4z6/DbccMP09NNPpzXXXLPz6lyezQT+Sp0/n3i88D/55JP05ZdfthTxAo4Ai1qvbd55 503zzTdf/Yk3fvlkTWUVNuwnQnA0WwRiWTmksgpJ3377bb3PsgoazV30fd0IoNhef/31YbfZYIMN Uvlkb/cdcsghqaym0v3335/Kii2VlWSthVWYxZuq83lH4P2dLbx79RT32cxir732Sj/88EMqq9x0 zTXXpKlTp9bQKqu02mdZoYyqhZhfzLPzecTlCKoI8TPOOCNdfvnl6b333ktlNZ3OPPPMYR9enQ/W r2vnbbovlxVftf7mm29SWe2le++9t/sq/D0bCcwUWOuuu279NI1Ps2b74IMP6qoiar22V155pQZc rMRWW221+qL6+uuv26vGCzfeQKPdjjjiiPpmPO6449K222472pv3ff0IljnnnDM98cQTw27zzjvv pPXWW6/dt9RSS6VddtklXXrppXW10awy4znHyu3OO+9srxsXYlUYK5Oxbuuss05dsXbeR/QUwbH8 8svXu40VSYRWrEQjOKOX/fbbL11yySVp8cUXr0EzmsdfddVVUzk0HnaTchjWBudBBx2UymFqKoeD 6dBDD01HHnnksOt2/tGva+dtui/H48Tq/OWXX66/zz///O6r8PdsJDAuVhCxgmm2ePGvssoqacaM Gc2uekgXq41mRRGFCLFme+CBB9JOO+2U4jrlvEs9vNp///1TvLlihXDKKaekTTbZpF49Hi9WBL// /ntz8/o7VmWdq5nYGYcccT+33357ik/akbb4BP7uu+/a+437i615nOY5Np/6nfcVq8NyPio9/PDD dSUXtVjBxJvkpJNO6rxqihCNFda+++7b7o9g2XjjjVMcvsR9fPrppzVAooc4TG2eV9NDc8PoubOf pudm36mnnlpDKA7Jmi0O2U8++eRhh79xWBgfCBEgscXveKOXc5PNzXr+7jWLOOyNQ8wLL7wwlfN4 9TD/pptuqofHYRLPe+edd67zXnnllWe633iO8bxi68e1ec5qTuX8ab2vCObwbYI6dl522WXplltu qXX+mU0Eyosql5VDPcnanMMrb9RcVlO5fJrlcq4mlxdpLudHmnIub85cDn/y6aefns8555xcXsD5 888/b+txMrkcVsTSIpdDwXofUSxvtlxWYXX/2WefneNkdWxx4rWscHIJyhwnxzu3OLHb+aVAZ625 /OSTT7b3W95o9SRwnPyNxy/nYGpv8Rzi7xJAM53wj/spYZfLIV/eY489cjnsqCfUyxu3eYj2d3nT 1ufb7vjzQpyILqub+hhl5ZVLqNRKCa9cVoh1/4477pife+65uj+uX8791f0XXHBBLm/y3HxBUc77 5XKIWa8XNiUQ6xcCV111Vb2v7i8sypt9ppPzszJTs4j7Lh8S9QuH8IovZeJLg9jCqJxDqj1HLX7K Obb6RUv0UIKtzr2cw8zxJUlzG+Ua9zurOZXVVT7qqKNy+QCtr7fnn3++3m/8U1a/Ob4kYJt9BAbi qZYXXs/tzTffrIcU3Z+ksVraeuut03nnnVdXS3Ho0b3Fp3Gc54gTsnH+Y6xbnJdZaaWV0mjPxYz1 8eIcVaweyzeC9TCx1/3E4V/55qxXKb377rt1ZdicPO55pVHujMeLw7L4MiNOfPfaunuK1VN8ETLW LVZXsRJedtll27uIleOVV15ZDwM//PDDuqKNfbEai1XgSF969OPaPlDHhfLtZIqfOMXQ/TqLlVwc yjdfanTcjIv/UYG/vgrs8QTjfMhI2/zzz5/ip9cWL6Q4tBzrFi/GCIU43IxDlP/XFoehnd+a9npc FVZxXfWNWa/76XdfPF4cbo+0dff0d8IqHieCsTsc49xYfOsb31x2fnsZ4TVSWMX99eMa1+ve4sMu frrDKq634IILdl+dv//jAiMGVq/nHuca4gUaX6H/W1t8iseJ9uWWWy5NmTJllm+Gf6sP7ne4QHzx UQ5b67m9WHXHajKC6oQTThh+Rf5C4F8SGPGQsNdjxlfZ5dxDLcUKKk6K/9NbOR9Wv6maNGnSsEOS f/pxuL/RC5T/SDQNDQ3V1dc222xTv7Ec/b1wCwTGJjCQzq0nT8d2a26FAAII/EMCebI8nd4+wkz/ HVZb4QICCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0 AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENAC BJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQ WNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBg aRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGl bagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2 oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqG CgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsq CCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagg gICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIA AmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgII mAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBg JkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZ AIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYC BJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQ WGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBg mQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFl NhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZ QGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYD oR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2E dhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDa QQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgH AQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0E ENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBA QAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQAB LUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0 AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENAC BJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQ WNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBg aRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGl bagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2 oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqG CgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsq CCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagg gICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIA AmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgII mAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBg JkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZ AIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYC BJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQ WGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBg mQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFl NhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZ QGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYD oR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDaQQABLUBgaRsqCCBgJkBgmQ2E dhBAQAsQWNqGCgIImAkQWGYDoR0EENACBJa2oYIAAmYCBJbZQGgHAQS0AIGlbagggICZAIFlNhDa QQABLUBgaRsqCCBgJkBgmQ2EdhBAQAsQWNqGCgIImAkQWGYDoR0EENAC44cGh3TVpDI05N9jP1SD g4P9XI3rIICAEGCFJWDYjQACfgIElt9M6AgBBIQAgSVg2I0AAn4CBJbfTOgIAQSEAIElYNiNAAJ+ AgSW30zoCAEEhACBJWDYjQACfgIElt9M6AgBBIQAgSVg2I0AAn4CBJbfTOgIAQSEAIElYNiNAAJ+ AgSW30zoCAEEhACBJWDYjQACfgIElt9M6AgBBITAQC6bqLEbAQQQsBJghWU1DppBAIGRBAiskXSo IYCAlQCBZTUOmkEAgZEEBtK5iXNYIwlRQwCBvgX+zv9yfcKECbN8HFZYsyTiCggg4CLwP/IRnkNK OO3RAAAAAElFTkSuQmCC