<!DOCTYPE html> <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" /> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <style> div { position: absolute; } .scroller-x { overflow: scroll; scroll-snap-type: x mandatory; width: 500px; height: 500px; } .scroller-y { overflow: scroll; scroll-snap-type: y mandatory; width: 500px; height: 500px; } .space { width: 4000px; height: 4000px; } .target { scroll-snap-align: start; height: 400px; width: 400px; } .large-x { width: 3000px; background-color: yellow; } .large-y { height: 2000px; background-color: yellow; } .small { height: 200px; width: 200px; background-color: black; } </style> <div class="scroller-x" id="one-target"> <div class="space"></div> <div class="large-x target" id="single" style="left: 200px;"></div> </div> <div class="scroller-x" id="x"> <div class="space"></div> <div style="left: 200px;"> <div class="target large-x"></div> <div class="target small" style="left: 200px"></div> <div class="target small" style="left: 600px"></div> <div class="target small" style="left: 1200px"></div> </div> </div> <div class="scroller-y" id="y"> <div class="space"></div> <div style="top: 200px;"> <div class="target large-y"></div> <div class="target small" style="top: 200px"></div> <div class="target small" style="top: 600px"></div> <div class="target small" style="top: 1200px"></div> <div class="target large-y" style="top: 2000px"></div> </div> </div> <div class="scroller-x" id="two-axes" style="scroll-snap-type: both mandatory"> <div class="space"></div> <div class="target large-x" style="top: 200px"></div> </div> <div class="scroller-x" id="overlapping-overflow" style="scroll-snap-type: both mandatory"> <div class="space"></div> <div style="left: 200px; top: 200px;"> <div class="target small"></div> <div class="target small"></div> <div class="target small"></div> <div class="target large-y large-x"></div> <div class="target small"></div> <div class="target small"></div> <div class="target small"></div> </div> </div> <script> var one_target_scroller = document.getElementById("one-target"); var scroller_x = document.getElementById("x"); var scroller_y = document.getElementById("y"); var two_axes_scroller = document.getElementById("two-axes"); var overlapping_scroller = document.getElementById("overlapping-overflow"); test(() => { scroller_x.scrollTo(950, 0); assert_equals(scroller_x.scrollLeft, 1000); assert_equals(scroller_x.scrollTop, 0); }, "Snap within a snap area which covers snapport on x selects a valid snap " + "position that avoids the overlapping areas at 800-1000 and 1400-1600."); test(() => { scroller_y.scrollTo(0, 950); assert_equals(scroller_y.scrollLeft, 0); assert_equals(scroller_y.scrollTop, 1000); }, "Snap within a snap area which covers snapport on y selects a valid snap " + "position that avoids the overlapping areas at 800-1000 and 1400-1600."); </script>