A variety of methods allow the user to control content size on mobile devices with small screens. At the browser level, these methods are generally available to assist a wide audience of users. At the platform level, these methods are available as accessibility features to serve people with visual impairments or cognitive disabilities.
What to Consider
Use terse, efficient markup.
Page Size Limit
Ensure that the overall size of the page is appropriate to the memory limitations of the device.
Style Sheets Size
Keep style sheets small.
Limit scrolling to one direction, unless secondary scrolling cannot be avoided.
Mobile Accessibility: How WCAG 2.0 and Other W3C/WAI Guidelines Apply to Mobile
Mobile Accessibility Standards and Guidelines at W3C