viewport-read-size-in-iframe-causes-layout.html

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This WPT test may be referenced by the following Test IDs:
- /visual-viewport/viewport-read-size-in-iframe-causes-layout.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta name="viewport" content="width=device-width, minimum-scale=1">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

  iframe {

    width: 200px;

    height: 300px;

</style>

<h4>This test checks that requesting the viewport size in an iframe causes any pending layout to occur.</h4>

<iframe srcdoc="<!DOCTYPE html><style>html{height:100%}</style>"></iframe>

<script>

  async_test(function(t) {

    window.onload = t.step_func(function() {

      assert_equals(frames[0].window.visualViewport.width, 200,

          "Reading width of iframe viewport should match iframe width.");

      assert_equals(frames[0].window.visualViewport.height, 300,

          "Reading height of iframe viewport should match iframe height.");

      // Add overflow so scrollbars appear.

      window.frames[0].window.document.body.style.width = "2000px";

      window.frames[0].window.document.body.style.height = "2000px";

      var viewportWidth = frames[0].window.visualViewport.width;

      var viewportHeight = frames[0].window.visualViewport.height;

      assert_equals(viewportWidth, frames[0].window.document.documentElement.clientWidth,

          "Reading width of iframe viewport should cause a layout and exclude the new scrollbar.");

      assert_equals(viewportHeight, frames[0].window.document.documentElement.clientHeight,

          "Reading height of iframe viewport should cause a layout and exclude the new scrollbar.");

      t.done();

});

});

</script>