mediawiki-skins-Vector/resources/skins.vector.styles/layout.less
Nicholas Ray bfc95effdb Move sidebar into header to improve tab order
* Moves the sidebar into the header so that user can tab directly from
the sidebar button into the sidebar (when open).

* Because the sidebar is absolutely positioned inside the header and the
header applies a top-margin, we need to adjust the top position
calculation for the sidebar.

* Removes the checkbox from the accessibility tree through CSS `display:
none;` instead of HTML attributes.

* Given that the checkbox is not able to receive focus, the
`#mw-sidebar-checkbox:focus ~ .mw-header .mw-checkbox-hack-button` CSS
rule is obsolete and moved instead to the label button. An additional
outline: 0 rule was added to remove the dotted outline that Firefox
applies.

* Makes the "Skip to navigation" jump link point to the sidebar now.
After the sidebar has been tabbed through, the rest of the navigation
can be tabbed to.

Bug: T246420
Change-Id: I981da3650854568bb9cfbf3c6c59e7625e7d094c
2020-06-25 16:55:34 -06:00

162 lines
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// Layout rules divide the page into sections and how VectorComponents should be arranged in the skin.
// The rules here should only define the layout, not color or typography.
@import '../../variables.less';
@import 'mediawiki.mixins.less';
// Modern layout variables
@height-tabs: 2.5em; // Keep in sync with .vector-menu-tabs height.
@margin-top-sidebar: 0.5em;
// Header sizes defined in the description of T246170 and comment T246170#5957100
@padding-left-sidebar: 0.5em;
@padding-horizontal-header: @margin-end-portal +
@padding-left-sidebar +
( @margin-start-nav-main-body / @font-size-nav-main-heading );
@padding-vertical-header: 0.125em;
@margin-top-header: 0.625em;
@margin-bottom-header: 0.3125em;
@height-logo-icon: 3.125em; // Logo sizes per specification in T245190.
@height-header: @height-logo-icon +
@margin-top-header + @margin-bottom-header +
2 * @padding-vertical-header;
@width-grid-column-one: 11em;
body {
// General background/foreground color definition as one exception to the rule.
background-color: @background-color-base;
color: @color-base;
// Vertical scrollbar always visible.
overflow-y: scroll;
}
.mw-body,
.parsoid-body {
direction: ltr;
padding: @padding-content;
}
.mw-body {
// Will be removed when we limit content width (T246420).
/* Border on top, left, and bottom side */
border: @border-width-base @border-style-base @border-color-content;
border-right-width: 0;
/* Merge the border with tabs' one (in their background image) */
margin-top: -@border-width-base;
.firstHeading {
/* Change the default from mediawiki.skinning CSS to let indicators float into heading area */
overflow: visible;
}
}
/* Space for header above content */
.mw-header-placeholder {
// Reserve space for the absolute positioned header and tabs.
height: @height-header + @height-tabs;
}
/* Header layout */
.mw-header {
position: absolute;
top: 0;
left: 0;
right: 0;
// A height is set to account for projects where no icon is set.
height: @height-logo-icon;
margin: @margin-top-header 0 @margin-bottom-header;
padding: @padding-vertical-header @padding-horizontal-header;
// Vertical centering of header elements (IE>=11), requires flex.
// Non-flex fallback for IE<=9: float rule on the child elements.
.flex-display();
// https://caniuse.com/#search=align-items
align-items: center;
z-index: @z-index-header;
}
/* Main column */
.mw-body,
#mw-data-after-content,
#left-navigation,
.mw-footer {
margin-left: @width-grid-column-one;
}
/* Content */
.mw-indicators {
float: right;
z-index: @z-index-indicators;
}
.mw-body-content {
position: relative;
z-index: @z-index-base;
}
/* Hide, but keep accessible for screen-readers */
#mw-navigation h2 {
position: absolute;
top: -9999px;
}
/* Tabs */
#mw-head {
position: absolute;
top: 0;
right: 0;
width: 100%;
}
/* Navigation Containers */
#left-navigation {
float: left;
margin-top: @height-header;
/* When right nav would overlap left nav, it's placed below it
(normal CSS floats behavior). This rule ensures that no empty space
is shown between them due to right nav's margin-top. Page layout
is still broken, but at least the nav overlaps only the page title
instead of half the content. */
margin-bottom: -@height-header;
}
#right-navigation {
float: right;
margin-top: @height-header;
}
#p-personal {
position: absolute;
top: @top-personal-tools;
right: 0.75em;
z-index: @z-index-personal;
ul {
// Keep from spilling out into the first column
// For completeness this should also include the width of the logo.
// As a result it is possible for the personal tools to overlap the logo.
padding-left: @width-grid-column-one;
}
li {
display: inline-block;
}
}
#mw-panel {
position: absolute;
// The sidebar is absolutely positioned inside the header which applies a top
// margin so we need to subtract this top margin in order to get the correct
// sidebar position.
top: @height-header - @margin-top-header;
left: 0;
width: @width-grid-column-one;
.box-sizing( border-box );
margin-top: @margin-top-sidebar;
padding-left: @padding-left-sidebar;
z-index: @z-index-sidebar;
}
.mw-footer {
margin-top: 0;
}