| <!DOCTYPE html> |
| <html id=root> |
| <title>CSS Anchor Positioning: position-area vs initial containing block</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position/#position-area"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| :root { |
| margin: 10px 20px; |
| border: 2px solid; |
| overflow: hidden; |
| } |
| #anchored { |
| position: fixed; |
| inset: 0; |
| border: solid orange; |
| } |
| #sizer { |
| position: absolute; |
| inset: 0; |
| height: 100vh; |
| width: 100vw; |
| } |
| |
| </style> |
| <div id="sizer"></div> |
| <div id="container"> |
| <div id="anchored"></div> |
| </div> |
| <script> |
| function check(title, expected_offsets) { |
| test(() => { |
| assert_equals(anchored.offsetLeft, expected_offsets.left, "Check expected offsetLeft"); |
| assert_equals(anchored.offsetTop, expected_offsets.top, "Check expected offsetTop"); |
| assert_equals(anchored.offsetWidth, expected_offsets.width, "Check expected offsetWidth"); |
| assert_equals(anchored.offsetHeight, expected_offsets.height, "Check expected offsetHeight"); |
| }, "Offsets for: " + title); |
| } |
| |
| vh = sizer.offsetHeight; |
| vw = sizer.offsetWidth; |
| |
| check("position-area: none for basic ICB", {left:0, top:0, width:vw, height:vh}); |
| |
| anchored.positionArea = "span-all"; |
| check("position-area: span-all for basic ICB", {left:0, top:0, width:vw, height:vh}); |
| |
| sizer.style.width = "200vw"; |
| sizer.style.height = "200vh"; |
| check("position-area: span-all for abspos overflowing ICB", {left:0, top:0, width:vw, height:vh}); |
| |
| sizer.style.position = "static"; |
| check("position-area: span-all for in-flow overflowing ICB", {left:0, top:0, width:vw, height: vh}); |
| |
| root.style.width = "200vw"; |
| check("position-area: span-all for root overflowing ICB", {left:0, top:0, width: vw, height: vh}); |
| |
| root.style.width = "50%"; |
| root.style.height = "50%"; |
| check("position-area: span-all for abspos overflowing ICB and reduced root", {left:0, top:0, width:vw, height:vh}); |
| |
| anchored.style.positionArea = "none"; |
| check("position-area: none for in-flow overflowing ICB and reduced root", {left:0, top:0, width:vw, height:vh}); |
| </script> |
