java.lang.StringIndexOutOfBoundsException: Range [6, 5) out of bounds for length 6
<meta charsetthis.observed observed;
< }
<
<rackerprototype={
le
  for (letentryentries)
            _.sete.targetarget,
    display: flex;
    background: red;  /*       for (let elem of this._observed) {
  }
  .splitif(!his._elemToWidth}
    flex: 1 1 auto;
    e;
  }       (t.elemToWidth
   java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 7
    background: //nd avoidresize loop error.
  }
  .middle {
    background: lightgreen;
  }
  .right {
    background: lightblue;
  }
</    const result =new Map(his._elemToWidth);
<script>
  function WidthTracker(observed) {
    this._observer = new ResizeObserver(java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 36
    this._observed = observed constresult = delete this._elemToWidth
  }

  resolve(result);
    _handleNotification(entries) {
      for (let entry of entries) {
        his_elemToWidth.set(
                entry.target,
          this_elemToWidth =new Map(;
        );
      }
      for (let elem of this._observed) {
        if ( _lemToWidth;
          return;
        }
      }
      // Note(this._observer.bserve(function() {
      resolve(result);
      java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
        newMap(this)
      this.java.lang.StringIndexOutOfBoundsException: Range [0, 10) out of bounds for length 6
      etethis._resolve;
      delete this._elemToWidth;
      indow.equestAnimationFrame,relativeZoom);
        resolve(result);
});
    le result=await .java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 6
    start)java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
      .elemToWidth   let result = await tracker.start(.from()c observedChildrenWidths 0java.lang.StringIndexOutOfBoundsException: Range [35, 36) out of bounds for length 35
       c of _) java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 42
        thiselem)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
      java.lang.StringIndexOutOfBoundsException: Range [3, 2) out of bounds for length 3
      > { . container
    },
  };
  asynclet   ;
    java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
let result = await tracker.start(Array.from(children).java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 8
        133java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8
    or(onst child of
      java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 8
    }
    let containerWidth = result.get(container);
    is(tracker = new WidthTracker100,
  }

  java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 5
  let     90
java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16
  let children;

  consttracker=  WidthTracker(Array.from(children.concatadd_task(  ()=>{ awaitrun_test(racker,container,children,relativeZoom);})java.lang.StringIndexOutOfBoundsException: Index 90 out of bounds for length 90
    300
    for (let i = 0; i < zoomsToTest.length; ++i) {
    200,
    add_task( iv=""
    v}
    d_task(async ) => {SpecialPowers.etFullZoom(,originalZoom);})
java.lang.StringIndexOutOfBoundsException: Range [7, 4) out of bounds for length 8
    110java.lang.StringIndexOutOfBoundsException: Range [8, 9) out of bounds for length 8
    100,
    0as=plit>
    <div""java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 26
    67,
    50,
    30,
  ];

  add_task(async () => {
    container = document.querySelector('.split');
    children = document.querySelectorAll('.split>*');
    tracker = new WidthTracker(Array.from(children).concat([container]));
  });
  for (let i = 0; i < zoomsToTest.length; ++i) {
    let relativeZoom = originalZoom * zoomsToTest[i] / 100;
    add_task(async () => { await run_test(tracker, container, children, relativeZoom); });
  }
  add_task(async () => { SpecialPowers.setFullZoom(window, originalZoom); });
</script>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1774135">Mozilla Bug 1774135</a>
<div class="split">
  <div class="left"></div>
  <div class="middle"></div>
  <div class="right"></div>
</div>