<a>getting a property</a> named "<code>width</code>"

from<var>parameters</var></a>.

<li><p>If<var>width</var> is<a>undefined</a>, let<var>width</var>

be null.

<li><p>Let<var>height</var> be the result of

<a>getting a property</a> named "<code>height</code>"

from<var>parameters</var>.

<li><p>If<var>height</var> is<a>undefined</a>, let<var>height</var>

be null.

<li><p>Let<var>x</var> be the result of<a>getting a property</a>

named "<code>x</code>" from<var>parameters</var>.

<li><p>If<var>x</var> is<a>undefined</a>, let<var>x</var> be null.

<li><p>Let<var>y</var> be the result of<a>getting a property</a>

named "<code>y</code>" from<var>parameters</var>.

<li><p>If<var>width</var> or<var>height</var> is neither<a>undefined</a>

nor a<a>Number</a> from 0 to 2³¹ − 1,

return<a>error</a> with<a>error code</a><a>invalid argument</a>.

<li><p>If<var>y</var> is<a>undefined</a>, let<var>y</var> be null.

<li><p>If<var>x</var> or<var>y</var> is neither<a>undefined</a>

nor a<a>Number</a> from −(2³¹) to 2³¹ − 1,

<li><p>If<var>width</var> or<var>height</var> is neither null, nor

a<a>Number</a> from 0 to 2³¹ − 1, return<a>error</a>

with<a>error code</a><a>invalid argument</a>.

<li><p>If<var>x</var> or<var>y</var> is neither null, nor

a<a>Number</a> from −(2³¹) to 2³¹ − 1,

return<a>error</a> with<a>error code</a><a>invalid argument</a>.

<li><p>If the<a>remote end</a> does not support

the<a>Set Window Rect</a><a>command</a> for

<var>session</var>&apos;s<a>current top-level browsing context</a> for any reason,

return<a>error</a> with<a>error code</a><a>unsupported operation</a>.

<var>session</var>&apos;s<a>current top-level browsing context</a>

for any reason, return<a>error</a> with<a>error

code</a><a>unsupported operation</a>.

<pclass="note">In case the<a>Set Window Rect</a> command is

partially supported (i.e. some combinations of arguments are

of<var>window</var>:

<li><p>If<var>width</var> is not<a>undefined</a>, set the width,

<li><p>If<var>width</var> is notnull, set the width,

in<a>CSS pixels</a>, of<var>window</var>, including

any<a>browser chrome</a> and externally drawn window decorations,

to a value that is as close as possible to<var>width</var>.

<li><p>If<var>height</var> is not<a>undefined</a>, set the height,

<li><p>If<var>height</var> is notnull, set the height,

in<a>CSS pixels</a>, of<var>window</var>, including

any<a>browser chrome</a> and externally drawn window decorations,

to a value that is as close as possible to<var>height</var>.

<li><p>If the implementation is able to set the position of<var>window</var>:

<li><p>If<var>x</var> is not<a>undefined</a>, run specific

steps set the x-coordinate of theleft edge of<var>window</var>

to a value that is as close aspossible to<var>x</var>.

<li><p>If<var>x</var> is notnull, set the x-coordinate of the

left edge of<var>window</var> to a value that is as close as

possible to<var>x</var>.

<li><p>If<var>y</var> is not<a>undefined</a>, run specific

steps set the y-coordinate of the topedge of<var>window</var> to

a value that is as close as possibleto<var>y</var>.

<li><p>If<var>y</var> is notnull, set the y-coordinate of the top

edge of<var>window</var> to a value that is as close as possible

to<var>y</var>.

<asideclass=note>