wpt/css/css-flexbox/flexbox-min-height-auto-003.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS Test: Testing min-height:auto & 'overflow' interaction</title>
    <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
    <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#min-size-auto">
<!--
     This testcase checks how "overflow-y" impacts the sizing behavior of flex
     items with "min-height:auto" (the new initial value for "min-height").

     In particular, the flex-item-specific "min-height:auto" behavior is
     supposed to be disabled (e.g. we end up with min-height:0) when
     "overflow-y" is non-"visible".
-->
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <style>
      .flexbox {
        display: flex;
        flex-direction: column;
        height: 30px;  /* Shrink flex items below min-height */
        margin-right: 2px; /* (Just for spacing things out, visually) */
        float: left;
      }

      .flexbox > * {
        /* Flex items have purple border: */
        border: 2px dotted purple;
      }

      .flexbox > * > * {
        /* Flex items' contents are gray & fixed-size: */
        background: gray;
        width: 40px;
        height: 80px;
      }

      .yvisible { overflow-y: visible; }
      .yhidden  { overflow-y: hidden;  }
      .yscroll  { overflow-y: scroll;  }
      .yauto    { overflow-y: auto;    }
    </style>
  </head>
  <body>
    <!-- min-height:auto should prevent shrinking below intrinsic height when
         the flex item has "overflow-y: visible", but not for any other
         overflow-y values. -->
    <div class="flexbox" id="visible"><div class="yvisible"><div></div></div></div>
    <div class="flexbox" id="hidden"><div class="yhidden"><div></div></div></div>
    <div class="flexbox" id="scroll"><div class="yscroll"><div></div></div></div>
    <div class="flexbox" id="auto"><div class="yauto"><div></div></div></div>
    <script>
      function verticalScrollbarWidth() {
        const probe = document.createElement("div");
        probe.style.cssText =
          "position:absolute;visibility:hidden;width:100px;height:100px;overflow-y:scroll;";
        document.body.appendChild(probe);
        const w = probe.offsetWidth - probe.clientWidth;
        probe.remove();
        return w;
      }
      const SCROLLBAR = verticalScrollbarWidth();

      // Flex item border-box height: 80px content + 2*2px border = 84px.
      const INTRINSIC_HEIGHT = 84;
      // Shrunk to fit the 30px container.
      const SHRUNK_HEIGHT = 30;
      // Flex item border-box width without scrollbar gutter:
      //   40px content + 2*2px border = 44px.
      const BASE_WIDTH = 44;

      test(() => {
        const item = document.querySelector("#visible > *");
        assert_equals(item.offsetHeight, INTRINSIC_HEIGHT, "offsetHeight");
        assert_equals(item.offsetWidth, BASE_WIDTH, "offsetWidth");
      }, "overflow-y:visible: min-height:auto holds; width has no scrollbar gutter");

      test(() => {
        const item = document.querySelector("#hidden > *");
        assert_equals(item.offsetHeight, SHRUNK_HEIGHT, "offsetHeight");
        assert_equals(item.offsetWidth, BASE_WIDTH, "offsetWidth");
      }, "overflow-y:hidden: min-height:auto resolves to 0; no scrollbar gutter");

      test(() => {
        const item = document.querySelector("#scroll > *");
        assert_equals(item.offsetHeight, SHRUNK_HEIGHT, "offsetHeight");
        assert_equals(item.offsetWidth, BASE_WIDTH + SCROLLBAR, "offsetWidth");
        assert_equals(item.scrollWidth, item.clientWidth, "no horizontal overflow");
      }, "overflow-y:scroll: min-height:auto resolves to 0; width includes scrollbar gutter");

      test(() => {
        const item = document.querySelector("#auto > *");
        assert_equals(item.offsetHeight, SHRUNK_HEIGHT, "offsetHeight");
        assert_equals(item.offsetWidth, BASE_WIDTH + SCROLLBAR, "offsetWidth");
        assert_equals(item.scrollWidth, item.clientWidth, "no horizontal overflow");
      }, "overflow-y:auto: min-height:auto resolves to 0; width includes scrollbar gutter");
    </script>
  </body>
</html>