This CSS property controls the display of the system-provided callout bubble on touch-based devices, specifically within the iOS WebView context. The callout bubble typically appears when a user performs a long press on a link or other selectable element. It presents options such as copying the link address or opening it in a new tab. Disabling this feature prevents the bubble from appearing, offering more control over the user interface and interaction within the WebView. For example, setting `-webkit-touch-callout: none;` will suppress the callout on elements where it is applied.
Suppression of the callout bubble can be vital in creating a more immersive or customized user experience. By preventing the default system behavior, developers can implement custom context menus or other interactive elements that better align with the application’s design and functionality. Historically, managing touch interactions within WebViews on iOS required careful handling to avoid disruptive or unwanted system interventions. Controlling the callout bubble represented a step towards more predictable and tailored touch behavior. It also aids accessibility since default callout could block some screen readers from working.
