Remove Extra Spacing In Between NumericUpDownExtender Default Buttons (ASP.NET Ajax)
When integrating NumericUpDown Extender to your asp.net apps, there's a wide gap in between the up/down buttons as shown below: The trick to remove the extra space in between NumericUpDownExtender Default Buttons is to replace the doctype declaration in master page from: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> to: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Note: This DTD contains all HTML elements and attributes, INCLUDING presentational and deprecated elements (like font) as described in w3. So, I believe there are presentational elements or deprecated elements incorporated into this extender. Reference: StackOverflow Cheers!