Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Update contrast-minimum.html #3240

Closed
wants to merge 15 commits into from
Closed

Update contrast-minimum.html #3240

Changes from all commits
Commits
Show all changes
15 commits
Select commit Hold shift + click to select a range
37558f3
Update contrast-minimum.html
bruce-usab Jun 13, 2023
e2e1bf3
Update contrast-minimum.html
bruce-usab Jun 13, 2023
626fc38
Update contrast-minimum.html
bruce-usab Jun 13, 2023
ba1a532
Update contrast-minimum.html
bruce-usab Jun 13, 2023
32fcc55
Update contrast-minimum.html
bruce-usab Jun 13, 2023
c302458
Update contrast-minimum.html
bruce-usab Jun 13, 2023
9984d8d
Update contrast-minimum.html
bruce-usab Jun 13, 2023
7015825
Update contrast-minimum.html
bruce-usab Jun 13, 2023
724c11d
Update contrast-minimum.html
bruce-usab Jun 13, 2023
703b590
Update contrast-minimum.html
bruce-usab Jun 13, 2023
f7eb439
Update contrast-minimum.html
bruce-usab Jun 13, 2023
b9f8cf2
Update contrast-minimum.html
bruce-usab Jun 13, 2023
34916e8
Update contrast-minimum.html
bruce-usab Jun 13, 2023
adc7119
Update understanding/20/contrast-minimum.html
alastc Jun 15, 2023
0ff8553
Update understanding/20/contrast-minimum.html
mbgower Jun 23, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
11 changes: 5 additions & 6 deletions understanding/20/contrast-minimum.html
View file
Open in desktop
Expand Up @@ -13,15 +13,14 @@ <h1>Understanding Contrast (Minimum)</h1>
<h2>Intent of Contrast (Minimum)</h2>


<p>The intent of this Success Criterion is to provide enough contrast between text and its background so that it can be read by people with moderately low vision.
<p>The intent of this Success Criterion is to provide enough contrast between text and its background so that it can be read by people with limited vision, including color vision deficiencies.
Copy link
Contributor

@mbgower mbgower Jun 15, 2023 •
edited

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This change does make it less clear that the minimum contrast target is understood by the working group as not solving readability for all. Was this change intended to remove the phrase "low vision" or due to concern with the word moderately? If the former, how about "... with moderately limited vision,..."?

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

my motivation was to point to color vision deficiencies as being particularly addressed.

Copy link
Contributor

@mbgower mbgower Jun 26, 2023 •
edited

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

My concern is that that describes a condition, but we're actually talking about people. And there was a prior inference in the language that the WG understood this didn't solve things for everyone.
We can solve by the addition of "more" and a couple of other words

Suggested change
<p>The intent of this Success Criterion is to provide enough contrast between text and its background so that it can be read by people with limited vision, including color vision deficiencies.
<p>The intent of this Success Criterion is to provide enough contrast between text and its background so that it can be read by more people with limited vision, including those with color vision deficiencies.

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Of the two above, I prefer the original, since this about intent. But I agree that we should not overstate the efficacy of the SC. How about:

The intent of this Success Criterion is to provide enough contrast between text and its background so that reading is easier for some people with limited vision, including some people with color vision deficiencies.

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I like both new suggestions.

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I suggest:

The intent of this Success Criterion is to provide enough contrast between text and its background so that reading is easier for some people with limited vision, including people with color vision deficiencies.

This user group does not typically use contrast-enhancing assistive technology.
For people without color deficiencies, hue and saturation have minimal or no effect on legibility as assessed by reading performance (Knoblauch et al., 1991).
Color deficiencies can affect luminance contrast somewhat.
Therefore the contrast is calculated in such a way that color (hue) is not a key factor.
People who have a color vision deficit (often referred to as "color blindness") will also have adequate contrast between the text and the background.</p>
Some vision impairments impact perception of luminance contrast.
People who have a color vision deficit (often colloquially referred to as <q>color blindness</q>) will also require adequate contrast between the text and the background.</p>
The luminance and contrast calculations associated with this criterion are formulated in such a way that color (hue) is not a key factor.</p>
<p>The contrast ratio thresholds address the needs of people with the four types of red-green color blindness (deuteranomaly, protanomaly, protanopia, and deuteranopia) and the two types of blue-yellow color blindness (tritanomaly and tritanopia). Monochromacy is also addressed.</p>
<p>While end-user needs are the primary consideration behind the contrast ratios used, a ratio of 4.5:1 provides content authors a wide range of color options for foreground and background colors. A contrast ratio of 4.5:1 also allows content authors some limited options for three colors that each contrast with each other. (For example, a web page could use use a middle gray background color while featuring white and black body text.)</p>

<p>While end-user needs are the primary consideration behind the contrast ratios used, a ratio of 4.5:1 provides content authors a wide range of color options for foreground and background colors. A contrast ratio of 4.5:1 also allows content authors some limited options for three colors that each contrast with each other. For example, a web page could use use a middle gray background color while featuring white headings and black body text.</p>
<p>Text that is decorative and conveys no information is excluded. For example, if random
words are used to create a background and the words could be rearranged or substituted
without changing meaning, then it would be decorative and would not need to meet this
Expand Down