[Webkit-unassigned] [Bug 189513] New: Wrong static position for out-of-flow positioned element with different writing-mode than its containing block

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189513

            Bug ID: 189513
           Summary: Wrong static position for out-of-flow positioned
                    element with different writing-mode than its
                    containing block
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: obrufau at igalia.com

Run this code: http://jsfiddle.net/4pqcexn5/

```css
#container {
  position: relative;
  border: 5px solid;
  padding-left: 100px;
}
#container > * {
  writing-mode: vertical-lr;
}
#abspos {
  position: absolute;
}
```
```html
<div id="container">
  <div id="abspos">abspos</div>
  <div id="static">static</div>
</div>
```

The abspos element has all 'top', 'left', 'bottom' and 'right' properties set to 'auto', so it should appear at the static position.
However, instead, of being shifted 100px to the right due to padding-left, it's shifted 100px downwards.
The text 'abspos' should overlap 'static'.

This happens when an absolutely (or fixed) positioned element has a different writing mode than its containing block.
Chromium is also affected, Firefox does it right.

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