Giz Explains: How Blind People See The Internet. Your eyes are absorbing this web page. They’re passing over this, this, then this word, right now. That’s how reading works, online: you take this for granted. But what if you couldn’t? We grant our gaze to electronic screens for most of the day, and in return they give us anything we want. We stare; they glow. We rarely speak and neither do they. And this makes sense! But for millions of others – those who are unable to see – the web is a wildly different place. The Sightless Internet The most common way for the vision-impaired user to access the internet is with a traditional browser and text-to-speech software.
But to say that blind users just “hear” the internet is a gross oversimplification. Here, try this: Stop reading for a moment. Your habits aren’t just sight-dependent (obviously), they’re pretty weird. With a screen reader, there is no “looking”. Then, of course, there’s all that text. Of course there are tricks. Gadgets ‘n’ Apps I don’t totally buy it, but that’s not the point. Luminosity Colour Contrast Ratio Analyser. Colour Contrast The old Accessibility Evaluation and Repair Tools (AERT) suggested algorithm for determining colour contrast now directs here.
The AERT algorithm was never a recommendation, and WCAG 2.0's luminosity contrast algorithm is recommended instead. Success Criterion 1.4.3 of WCAG 2.0 requires the visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following: Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1; Incidental: Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.
Logotypes: Text that is part of a logo or brand name has no minimum contrast requirement. Analyse Luminosity Contrast Ratio. Check My Colours - Analyse the color contrast of your web pages. Coblis — Color Blindness Simulator. If you are not suffering from a color vision deficiency it is very hard to imagine how it looks like to be colorblind. The Color BLIndness Simulator can close this gap for you. Just play around with it and get a feeling of how it is to have a color vision handicap. As all the calculations are made on your local machine, no images are uploaded to the server.
Therefore you can use images as big as you like, there are no restrictions. Be aware, there are some issues for the “Lens feature” on Edge and Internet Explorer. So go ahead, choose an image through the upload functionality or just drag and drop your image in the center of our Color BLIndness Simulator. If there are any issues with the Color BLIndness Simulator please send a note through the contact page. As it is not not so easy to describe color blindness it comes in handy, that some smart people developed manipulation-algorithms to fake any form of color vision deficiency. Example Luminosity Contrast Ratios. Colorblind Web Page Filter.
Colour blindness. Validators for usability, accessibility, html, search engine optimisation - InfoQuest. Skip Navigation | Accessibility Validators | HTML Validators | Search Engine Marketing Validators | Accessibility Introduction | Accessibility References and Resources | Usability Introduction | Usability Resources | Search Engine Optimization References | InfoQuest! While most of the validators on this page have powerful fee-based versions, they all offer some form of free online validation of html syntax, accessibility, links, etc. Accessibility Validators Bobby -- Accessibility validatorThis is the grandfather of accessibility validators from the Center for Applide Assistive Technology (CAST). The free version available from the website will validate single pages for either W3C or Section 508.
WAVE This is the accessibility validator developed by Pennsylvania's Initiative on Assistive Technology (PIAT). A-Prompt ToolkitThis is a downloadable tool that identifies potential accessibility problems and provides guided editing to correct the problems. HTML Validators Dr. Yahoo!