I have created a Salesforce1 single page app with VisualForce page displaying HTML. The app uses HTML5 and CSS3. Some Android 4.2 and 4.3 devices will not display the HTML correctly inside the Salesforce1 native app. However, the page with HTML works perfectly when Salesforce1 runs in the Chrome browser on the mobile device.
So which browser am I building for in Salesforce1? Does it use the mobile device's default browser engine? If I update the device browser, will it also update the engine used by the Salesforce1 native app for rendering the visualforce HTML?