<!DOCTYPE html>
<title>Tests fallback positions that overflow the inset-modified containing block regardless of scrolling</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script src="support/test-common.js"></script>
<style>
body { margin: 0; }
.ltr { direction: ltr; }
.rtl { direction: rtl; }
.vrl { writing-mode: vertical-rl; }
.vlr { writing-mode: vertical-lr; }

.cb {
  width: 200px;
  height: 200px;
  transform: scale(1);
}

.spacer {
  block-size: 50px;
}

.anchor {
  width: 100px;
  height: 100px;
  margin-inline-start: 50px;
  background: orange;
  anchor-name: --a;
}

.anchored {
  position: absolute;
  width: 50px;
  height: 50px;
  background: lime;
}

.exceeds-end {
  position-fallback: --exceeds-end;
}

/* Used on a element whose block and inline axes are the same with its
   containing block, so that the first two positions will exceed the end edges
   of the IMCB, and the last position will be used. */
@position-fallback --exceeds-end {
  @try {
    left: 0;
    right: anchor(--a left);
    width: 100px;
  }

  @try {
    top: 0;
    bottom: anchor(--a top);
    height: 100px;
  }

  @try {
    top: 11px;
    left: 22px;
  }
}

.exceeds-start {
  position-fallback: --exceeds-start;
}

/* Used on a element whose block and inline axes are in the opposite directions
   of its containing block, so that the first two positions will exceed the
   start edges of the IMCB, and the last position will be used. */
@position-fallback --exceeds-start {
  @try {
    bottom: 0;
    top: anchor(--a bottom);
    height: 100px;
  }

  @try {
    right: 0;
    left: anchor(--a right);
    width: 100px;
  }

  @try {
    top: 11px;
    left: 22px;
  }
}

.exceeds-size {
  position-fallback: --exceeds-size;
}

/* Both inset sides are `auto`, but the size is too big to fit in the containing
   block. */
@position-fallback --exceeds-size {
  @try {
    top: anchor(--a bottom);
    left: auto;
    right: auto;
    width: 300px;
  }

  @try {
    left: anchor(--a right);
    top: auto;
    bottom: auto;
    height: 300px;
  }

  @try {
    top: 11px;
    left: 22px;
  }
}
</style>

<body onload="checkLayoutForAnchorPos('.anchored')">
  <div class=cb>
    <div class=spacer></div>
    <div class=anchor></div>
    <div class="anchored exceeds-end"
         data-offset-x=22 data-offset-y=11></div>
  </div>

  <div class="cb rtl vrl">
    <div class=spacer></div>
    <div class=anchor></div>
    <div class="anchored ltr vlr exceeds-start"
         data-offset-x=22 data-offset-y=11></div>
  </div>

  <div class="cb">
    <div class=spacer></div>
    <div class=anchor></div>
    <div class="anchored exceeds-size"
         data-offset-x=22 data-offset-y=11></div>
  </div>
</body>
