fix: improved accessibility in high contrast mode #1941
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| @@ -79,6 +80,10 @@ | |||
| border-radius: inherit; | |||
| pointer-events: none; | |||
| opacity: 0; | |||
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| @include md-high-contrast { | |||
| background-color: rgba(white, 0.5); | |||
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Could this be an issue with dark themes (where the text is white)?
(same for other components where you use a white background)
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It probably would, but I only went for the dark modes in this PR since supporting all modes would add more bloat.
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If we make these styles part of the theme, they can simply use the theme's background and foreground palettes to draw an appropriate color.
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This would look something like
// in _button-theme.scss
@include md-high-contrast {
background-color: if($theme.is-dark, white, black);
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Done, although I had to flip the conditions since the colors are inverted. Might have to re-test this after we have dark themes implemented.
| // Add an outline to make it more visible in high contrast mode. | ||
| @include md-high-contrast { | ||
| [md-button], [md-raised-button], [md-icon-button], [md-fab], [md-mini-fab] { | ||
| border: solid 1px; |
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Why border and not outline, since the latter won't affect layout?
(here and elsewhere)
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Good point, I hadn't though about it. I'll give it a try and see how it works out. One nice side effect of using the border is that we don't have to specify the color, it inherits from the text color.
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You could do the same for outline using currentColor
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I tried it out and it looks like using outline works, however we can't apply a radius to it. This means that the round buttons would end up looking like this:
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I think that is acceptable for high contrast mode.
crisbeto
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Switched over all of the |
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Slide-toggle colors also be affected by the theme? Dark themes should already be working; you can see an example on the sample app (toggle is on the top right). |
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I guess, although it seems like IE behaves the same both with the dark and the light theme. It doesn't try to invert colors. |
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@crisbeto in that case it seems fine, then |
jelbourn
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pr: lgtm
action: merge
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LGTM, just needs rebase |
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I'll rebase it, but it probably makes sense to revert the light/dark distinction for the button overlay. |
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That's fine if IE renders it the same either way |
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I mean IE renders the light and dark theme the same. In that case we should also use the same overlay color. |
a11y improvements to the following components in high contrast mode: * `button` - Adds an outline since only the text was visible. Also inverts the tint since it was hiding the text. * `card`, `dialog`, `menu`, `snack-bar`, `tooltip` - Adds an outline. * `select` - Adds an outline and prevents the ripple from hiding the option text. * `sidenav` - Fixes the backdrop not being opaque. * `slide-toggle` - Fixes component blending in completely with the background. Fixes angular#421. Fixes angular#1769.
crisbeto
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@crisbeto yeah, I meant that if IE treats light and dark the same way then it's fine to go back to how you originally had it. |
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a11y improvements to the following components in high contrast mode:
button- Adds an outline since only the text was visible. Also inverts the tint since it was hiding the text.card,dialog,menu,snack-bar,tooltip- Adds an outline.select- Adds an outline and prevents the ripple from hiding the option text.sidenav- Fixes the backdrop not being opaque.slide-toggle- Fixes component blending in completely with the background.Fixes #421.
Fixes #1769.