Hi,
This is a browser behavior, because RadSpell button is rendered as a standard <input type="button" name="name" value="Spell Check" /> button on the page and you will experience the same issue with the input button.
IE and Firefox have different padding for the text inside the input buttons which is causing the different width of the button in both browsers. In addition the width of the Spell Check text along with the padding exceeds the specified width of 80px.
If you would like you can set a different shorter string for the spellcheck button by setting the ButtonText="test" property or set the ButtonType property to "ImageButton" and render only an icon as discussed in this forum thread:
Rad Spell custom Image.
Another option is to apply different width via CSS class to the input of RadSpell using the following code:
Regards,
Rumen
the Telerik team
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