inline

The inline element can be used to define a set of options hence allowing for a better control over positioning of images within a content field (that is, basic field where mime-type is set to application/xhtml+xml)

You could, for example, enable/disable the image alignment option on a field by setting the value attribute to on or off. In addition a default alignment can be defined using value-if-unset as follows:

<field mime-type="application/xhtml+xml" type="basic" name="body">
 <ui:inline>
   <ui:alignment value="on">
    <ui:value-if-unset>top</ui:value-if-unset>
   </ui:alignment>
  </ui:inline>
</field>