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<concept id="GUID-F25C17AC-BA88-4965-BAE8-AEF0E2EA66EC" xml:lang="en"><title>Zooming actions</title><shortdesc>Mobile device users must be able to zoom in and out consistently

within applications on a mobile device. However the zooming actions

may  differ from one device model to another.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The product features and form factor of a mobile device determine

which zooming actions application developers should make available

on it: </p>

<ul>

<li><p>If the device has an ITU-T keypad, the asterisk (*) key zooms

in and the hash mark (#) key zooms out. This functionality is not

available in editors or other states where the keys play another role.

In these cases, the zoom functions, if applicable, must be available

in the <uicontrol>Options</uicontrol> menu. </p></li>

<li><p>If the device has a QWERTY or half-QWERTY keyboard, use the

two topmost keys at the top left of the keyboard for zooming in and

out. For example, on a Latin keyboard, use the Q key to zoom in and

the A key to zoom out. Some products might have zooming symbols printed

on the keyboard to help users find the zooming features. Again, the

functions are not available in editors.</p></li>

<li><p>On touch devices, users can use touch stripes to zoom. Finger

movement along the stripe controls zooming. Applications may support

different number of zoom levels. It should be possible to zoom across

the full range with one swipe.</p></li>

<li><p>On touch devices with multiple touch support, users can use

pinch zoom. See <xref href="GUID-17C64C2F-9426-4B41-9F0A-23060289D644.dita">Multiple touch</xref> section for more details on pinch in and pinch

out.</p></li>

<li><p>On touch devices, some applications may support double-tapping

zoom. A double tap can toggle between zoomed and normal view, but

this depends on the application.</p></li>

</ul>

</conbody></concept>