This stylelint-scss rule is useful because we were inconsistent when
using calc(); sometimes we added interpolation to Sass variables, and
sometimes we didn't. The reason why we originally added interpolation
was that it was necessary until we migrated to Dart Sass in commit
d54971e53. Since then, we can omit the interpolation, which is also what
the Sass documentation recommends [1].
[1] https://sass-lang.com/documentation/values/calculations/
The division operator `/` from Sass is deprecated because `/` is used in
CSS for uses other than dividing numbers. That's why we were getting
many warnings like:
```
Deprecation Warning: Using / for division outside of calc() is
deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div($line-height, 2) or calc($line-height / 2)
More info and automated migrator: https://sass-lang.com/d/slash-div
margin-top: $line-height / 2;
```
Since using math.div makes the code harder to read and `calc` is
universally supported by all browsers (although the implementation in
Internet Explorer doesn't work in certain cases), we're using `calc`
when assigning the value to a CSS property.
However, we're also using divisions when assigning Sass variables, and
in those cases using `calc` is trickier because sometimes these
variables are used in other operations. We'll handle these cases in the
next commit.
The Web Content Accessibility Guidelines version 2.1 added a success
criterion called Non-text Contrast [1], which mentions that the focus
indicator must contrast with the background, and version 2.2 introduced
a specific one regarding focus appearance [2]. According to that
criterion, the focus indicator:
* is at least as large as the area of a 2 CSS pixel thick perimeter of
the unfocused component or sub-component
* has a contrast ratio of at least 3:1 between the same pixels in the
focused and unfocused states.
Our current solution for highlighting elements on focus has a couple of
issues:
* It doesn't offer enough contrast against the default white background
(1.6:1)
* It offers even less contrast against other backgrounds, like the
homepage banner or the featured proposals/debates
Making the color of the outline darker would increase the contrast
against these backgrounds, but it would reduce the contrast against
other backgrounds like our default brand color.
For this reason, most modern browsers use a special double outline with
two different colors [3], and we're choosing to combine an outline and a
box shadow to emulate it, using the brand color as the second color.
However, this double-colored outline doesn't work so well when focusing
on dark buttons surrounded by a light background, so instead we're using
a triple outline, which works well on any color combination [4]. Since I
feel that making the third outline 2px wide makes the overall outline
too wide, I'm making the inner outline just 1px wide since that's enough
to prevent edge cases.
Note that Foundation adds a transition for the `box-shadow` property on
`select` controls, which gets in the way of the focus we use on the
language selector. So we're removing the transition.
Also note that the box-shadow style didn't work properly with the
box-shadow we added on the `:hover` status on cards, so we're changing
the code in order to cover this case.
Finally, note that the box-shadow isn't displayed properly on multiline
links (in Chrome, not even with `box-decoration-break: clone`), like the
ones in debates/proposals/polls/investments/processes titles, so we're
changing the style of these links to `inline-block`.
[1] https://www.w3.org/TR/WCAG21/#non-text-contrast
[2] https://www.w3.org/TR/WCAG22/#focus-appearance
[3] https://www.sarasoueidan.com/blog/focus-indicators/#examining-(current)-browser-focus-indicators-against-wcag-requirements
[4] https://www.erikkroes.nl/blog/the-universal-focus-state/
The `inverted-selection` rules defined in the `%brand-background`
selector weren't being applied because we were using this selector in
`::before` and `::after` pseudoelements. Not sure about the reason, but
it looks like the saturation of `::after::selection` pseudoelements
resulted in invalid selectors and so the inverted selection rules were
ignored for every selection using `%brand-background`, like
`%budget-header`.
Using `@include brand-background` instead of `@extend %brand-background`
in pseudoelements solves the issue. The inverted selection might not
work in these pseudoelements, but we don't need it there since these
pseudoelements don't have content.
Until now, overwriting the styles for a certain tenant was a very
tedious task. For example, if we wanted to use a different brand color
for a tenant, we had to manually overwrite the styles for every element
using that color.
It isn't possible to use different SCSS variables per tenant unless we
generate a different stylesheet per tenant. However, doing so would make
the CSS compilation take way too long on installations with more than a
couple of tenants, and it wouldn't allow to get the colors dynamically
from the database, which we intend to support in the future.
So we're using CSS variables instead. These variables are supported by
97% of the browsers (as of October 2022), and for the other 3% of the
browsers we're using the default colors (SCSS variables) instead.
CSS variables have some limitations: for instance, it isn't possible to
use functions like `lighten`, `darken` or `scale-color` with CSS
variables, so the application might behave in a strange way when we use
these functions.
It also isn't possible to automatically get whether black or white text
makes a better contrast with a certain background color. To overcome
this limitation, we're providing variables ending with `-contrast`. For
instance, since the default `$brand` color is a dark one, when assigning
a light color to `--brand`, we probably want to assign
`--brand-contrast: #{$black}` as well, so the text is still readable.
Captions benefit blind screen reader users who navigate through tables,
particularly in this case because we potentially have several tables
with headings (one table per group), so when navigating through tables
it might be hard to know which group the headings belong to.
In this case they also benefit sighted users. Usability tests have shown
the "Groups and headings" section is a bit confusing, so adding a
caption like "Headings in Districts" helps clarifying Districts is a
group and the table refers to headings in that group.
The very same table is rendered in the "headings" step of the budget
creation wizard. However, in that case the information of the caption is
redundant because the page is specific for headings belonging to a
certain group. We're making the element invisible but still keeping it
for screen reader users in order to ease their navigation through
tables.
Note we're keeping this section's original design (which had one button
to add a new group which after being pressed was replaced by a button to
cancel) but we aren't using Foundation's `data-toggle` because there
were a couple of usability and accessibility issues.
First, using `data-toggle` multiple times and applying it to multiple
elements led to the "cancel" button not being available after submitting
a form with errors. Fixing it made the code more complicated.
Second, the "Add new group" button always had the `aria-expanded`
attribute set to "true", so my screen reader was announcing the button
as expanded even when it wasn't. I didn't manage to fix it using
`data-toggle`.
Finally, after pressing either the "Add new group" and "Cancel" buttons,
the keyboard focus was lost since the elements disappeared.
So we're simplifying the HTML and adding some custom JavaScript to be
able to handle the focus and manually setting the `aria-expanded`
attribute.
Co-Authored-By: Javi Martín <javim@elretirao.net>
Co-Authored-By: Julian Herrero <microweb10@gmail.com>
