ImageButton.GenerateEmptyAlternateText Property
Assembly: System.Web (in system.web.dll)
[ThemeableAttribute(false)] public: virtual property bool GenerateEmptyAlternateText { bool get () override; void set (bool value) override; }
/** @property */ public boolean get_GenerateEmptyAlternateText () /** @property */ public void set_GenerateEmptyAlternateText (boolean value)
public override function get GenerateEmptyAlternateText () : boolean public override function set GenerateEmptyAlternateText (value : boolean)
Not applicable.
Property Value
false, indicating that the ImageButton control does not generate an alternate-text attribute when the AlternateText property is empty.By default, the ImageButton control renders the AlternateText property using an alt attribute. When the AlternateText property is not set, the ImageButton control does not include the alt attribute to specify the alternate-text in the control rendering.
The XHTML document type definition requires the alt attribute on image controls. However, accessibility best practices recommend that controls should not specify empty alternate-text attributes. You can meet both XHTML and accessibility requirements by setting the AlternateText property to a string describing the image; this generates an alt attribute for the control and sets the attribute to a meaningful value.
This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and Introduction to ASP.NET Themes.