The main principle here is that the web content must be capable of resizing. A PDF is created that conforms to PDF/Universal Accessibility (ISO 14289), the content can be reflowed and zoomed in to make reading possible for someone with low-vision.įAQ Mobile devices start smaller, how does that work?.The user can read the content easily and does not have to scroll sideways to read. A site uses responsive design and when a person zooms-in by over 300% the layout is reflowed to one column.From the WebAIM survey 25% of low vision users indicated needing magnification to 400% or more. A significant proportion of people with low vision need more than a 200% increase in the size of content. Of the 285 million people worldwide who are visually impaired, 14% are blind and 86% have low vision according to the World Health Organization (WHO). The benefits are primarily for people with low vision. User agents for technologies such as HTML/CSS, PDF and ePub have methods of reflowing content to fit the width of the window (viewport). horizontally in a vertically scrolling page). Given enough buttons, that toolbar may need to scroll in the direction of text (e.g. Lastly, interfaces which provide toolbars to edit content need to show both the content, and the toolbar in the viewport. As that relationship is essential to convey the content, this success criteria does not apply to data tables. Cutting up an image and stacking the blocks would render the content unusable so that is out of scope.Ĭomplex data tables have a two-dimensional relationship between the headings and data cells. For example, graphics and video are by their nature two dimensional. Many sites currently cater to that range of sizes, and that number will only increase as more sites update to be small-screen friendly.Ĭertain content cannot be reflowed without losing meaning so there is an exception for that type of content. A browser on a desktop or laptop at 1280px wide and then zoomed in to 400% means the view is then "equivelent to" 320px wide. The value of "320 CSS pixels" was chosen as a reasonable minimum size that authors can acheive as it lines up with small displays on mobile devices. Spatial relationships can vary, but all information and functionality should continue to be available. When appropriately authored, the content can reflow (wrap) to stay within the windows boundaries (viewport). Zoom functionality in browsers allows users to increase the size of all content. It is also important that content is not hidden off-screen, for example zooming on a vertically scrolling page should not cause content to be hidden to one side. The impact of horizontal scrolling can increase the effort required to read by 40-100 times, so avoiding scrolling should be the aim whenever feasible. Zooming the page for vertically written languages which scroll horizontally by default should not require vertical scrolling. English) should not require horizontal scrolling. Zooming the page for horizontally written languages where pages scroll vertically by default (e.g. ![]() ![]() The intent of this Success Criterion is to help people with low vision by allowing the browser zoom function to increase the size of most content to 400% without requiring scrolling in more than one direction. ![]() Understanding Reflow Understanding Reflow Intent
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