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RE: High Contrast support with Browsers.

From: Jonathan Avila <jon.avila@levelaccess.com>
Date: Mon, 14 May 2018 16:22:57 +0000
To: "Patrick H. Lauke" <redux@splintered.co.uk>, Jim Allan <jimallan@tsbvi.edu>, "seanmmur@cisco.com" <seanmmur@cisco.com>
CC: WAI-IG <w3c-wai-ig@w3.org>
Message-ID: <BY2PR03MB393332024B0F5A43C7C1240F19C0@BY2PR03MB393.namprd03.prod.outlook.com>
I’d also say that the high contrast offered by Chrome is not sufficient for the needs of users with low vision.  It’s an SVG filter that is applied and is not always effective and doesn’t provide the flexibility that Windows high contrast mode offers.  It sometimes makes content have less contrast and a whole page filter can’t solve specific contrast situations on every part of a page.  Windows High contrast mode offers the ability for users to customize the color of certain types of widgets, text, and backgrounds with the colors that work best for them.

Apple’s macOS has an interesting increase contrast feature which seems to work with standard components and increases the contrast of essential lines and text to above 7:1 ratio.  But it does not go as far as Windows high contrast mode in its flexibility.


Jonathan Avila
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From: Patrick H. Lauke [mailto:redux@splintered.co.uk]
Sent: Monday, May 14, 2018 11:50 AM
To: Jim Allan; seanmmur@cisco.com
Subject: RE: High Contrast support with Browsers.

Noting that on certain operating systems (iOS, Android, macOS, others?), high contrast is a low-level setting that affects ALL output at the operating system level (what’s sent to the video card/monitor), while on others (Windows, others?), it’s a setting that software needs to be specifically coded to read and then support/implement.


From: Jim Allan<mailto:jimallan@tsbvi.edu>
Sent: 14 May 2018 16:34
To: seanmmur@cisco.com<mailto:seanmmur@cisco.com>
Cc: WAI-IG<mailto:w3c-wai-ig@w3.org>
Subject: Re: High Contrast support with Browsers.

​Chrome does not respect High Contrast Mode (HCM​) in the OS. You must use an extension

respect OS HCM
IE , EDGE - https://support.microsoft.com/en-us/help/13862/windows-use-high-contrast-mode

FireFox https://support.mozilla.org/en-US/kb/accessibility-features-firefox-make-firefox-and-we#w_using-a-high-contrast-theme

Safari https://www.apple.com/accessibility/mac/vision/

On Tue, May 8, 2018 at 9:23 PM Sean Murphy (seanmmur) <seanmmur@cisco.com<mailto:seanmmur@cisco.com>> wrote:

General query in relation to high contrast with browsers. Should the browser honor the OS high contrast settings or should the CSS override the OS high contrast? My view is the browser should honor the OS high contrast settings. Not sure if this is the case now.

Sean Murphy
Accessibility Software ENGINEER
Tel: +61 2 8446 7751

Cisco Systems, Inc.
The Forum 201 Pacific Highway


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Jim Allan, Accessibility Coordinator
Texas School for the Blind and Visually Impaired
1100 W. 45th St., Austin, Texas 78756
voice 512.206.9315    fax: 512.206.9452 http://www.tsbvi.edu/
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Received on Monday, 14 May 2018 16:23:34 UTC

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