// stylelint-disable declaration-no-important, selector-no-qualifying-type, property-no-vendor-prefix
// Reboot
//
// Normalization of HTML elements, manually forked from Normalize.css to remove
// styles targeting irrelevant browsers while applying new styles.
//
// Normalize is licensed MIT. https://github.com/necolas/normalize.css
// Document
//
// 1. Change from `box-sizing: content-box` so that `width` is not affected by `padding` or `border`.
// 2. Change the default font family in all browsers.
// 3. Correct the line height in all browsers.
// 4. Prevent adjustments of font size after orientation changes in IE on Windows Phone and in iOS.
// 5. Change the default tap highlight to be completely transparent in iOS.
*,
*::before,
*::after {
box-sizing: border-box; // 1
}
html {
font-family: sans-serif; // 2
line-height: 1.15; // 3
-webkit-text-size-adjust: 100%; // 4
-webkit-tap-highlight-color: rgba($black, 0); // 5
}
// Shim for "new" HTML5 structural elements to display correctly (IE10, older browsers)
// TODO: remove in v5
// stylelint-disable-next-line selector-list-comma-newline-after
article, aside, figcaption, figure, footer, header, hgroup, main, nav, section {
display: block;
}
// Body
//
// 1. Remove the margin in all browsers.
// 2. As a best practice, apply a default `background-color`.
// 3. Set an explicit initial text-align value so that we can later use
// the `inherit` value on things like `<th>` elements.
body {
margin: 0; // 1
font-family: $font-family-base;
@include font-size($font-size-base);
font-weight: $font-weight-base;
line-height: $line-height-base;
color: $body-color;
text-align: left; // 3
background-color: $body-bg; // 2
}
// Future-proof rule: in browsers that support :focus-visible, suppress the focus outline
// on elements that programmatically receive focus but wouldn't normally show a visible
// focus outline. In general, this would mean that the outline is only applied if the
// interaction that led to the element receiving programmatic focus was a keyboard interaction,
// or the browser has somehow determined that the user is primarily a keyboard user and/or
// wants focus outlines to always be presented.
//
// See https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible
// and https://developer.paciellogroup.com/blog/2018/03/focus-visible-and-backwards-compatibility/
[tabindex="-1"]:focus:not(:focus-visible) {
outline: 0 !important;
}
// Content grouping
//
// 1. Add the correct box sizing in Firefox.
// 2. Show the overflow in Edge and IE.
hr {
box-sizing: content-box; // 1
height: 0; // 1
overflow: visible; // 2
}
//
// Typography
//
// Remove top margins from headings
//
// By default, `<h1>`-`<h6>` all receive top and bottom margins. We nuke the top
// margin for easier control within type scales as it avoids margin collapsing.
// stylelint-disable-next-line selector-list-comma-newline-after
h1, h2, h3, h4, h5, h6 {
margin-top: 0;
margin-bottom: $headings-margin-bottom;
}
// Reset margins on paragraphs
//
// Similarly, the top margin on `<p>`s get reset. However, we also reset the
// bottom margin to use `rem` units instead of `em`.
p {
margin-top: 0;
margin-bottom: $paragraph-margin-bottom;
}
// Abbreviations
//
// 1. Duplicate behavior to the data-* attribute for our tooltip plugin
// 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
// 3. Add explicit cursor to indicate changed behavior.
// 4. Remove the bottom border in Firefox 39-.
// 5. Prevent the text-decoration to be skipped.
abbr[title],
abbr[data-original-title] { // 1
text-decoration: underline; // 2
text-decoration: underline dotted; // 2
cursor: help; // 3
border-bottom: 0; // 4
text-decoration-skip-ink: none; // 5
}
address {
margin-bottom: 1rem;
font-style: normal;
line-height: inherit;
}
ol,
ul,
dl {
margin-top: 0;
margin-bottom: 1rem;
}
ol ol,
ul ul,
ol ul,
ul ol {
margin-bottom: 0;
}
dt {
font-weight: $dt-font-weight;
}
dd {
margin-bottom: .5rem;
margin-left: 0; // Undo browser default
}
blockquote {
margin: 0 0 1rem;
}
b,
strong {
font-weight: $font-weight-bolder; // Add the correct font weight in Chrome, Edge, and Safari
}
small {
@include font-size(80%); // Add the correct font size in all browsers
}
//
// Prevent `sub` and `sup` elements from affecting the line height in
// all browsers.
//
sub,
sup {
position: relative;
@include font-size(75%);
line-height: 0;
vertical-align: baseline;
}
sub { bottom: -.25em; }
sup { top: -.5em; }
//
// Links
//
a {
color: $link-color;
text-decoration: $link-decoration;
background-color: transparent; // Remove the gray background on active links in IE 10.
@include hover() {
color: $link-hover-color;
text-decoration: $link-hover-decoration;
}
}
// And undo these styles for placeholder links/named anchors (without href).
// It would be more straightforward to just use a[href] in previous block, but that
// causes specificity issues in many other styles that are too complex to fix.
// See https://github.com/twbs/bootstrap/issues/19402
a:not([href]):not([class]) {
color: inherit;
text-decoration: none;
@include hover() {
color: inherit;
text-decoration: none;
}
}
//
// Code
//
pre,
code,
kbd,
samp {
font-family: $font-family-monospace;
@include font-size(1em); // Correct the odd `em` font sizing in all browsers.
}
pre {
// Remove browser default top margin
margin-top: 0;
// Reset browser default of `1em` to use `rem`s
margin-bottom: 1rem;
// Don't allow content to break outside
overflow: auto;
// Disable auto-hiding scrollbar in IE & legacy Edge to avoid overlap,
// making it impossible to interact with the content
-ms-overflow-style: scrollbar;
}
//
// Figures
//
figure {
// Apply a consistent margin strategy (matches our type styles).
margin: 0 0 1rem;
}
//
// Images and content
//
img {
vertical-align: middle;
border-style: none; // Remove the border on images inside links in IE 10-.
}
svg {
// Workaround for the SVG overflow bug in IE10/11 is still required.
// See https://github.com/twbs/bootstrap/issues/26878
overflow: hidden;
vertical-align: middle;
}
//
// Tables
//
table {
border-collapse: collapse; // Prevent double borders
}
caption {
padding-top: $table-cell-padding;
padding-bottom: $table-cell-padding;
color: $table-caption-color;
text-align: left;
caption-side: bottom;
}
// 1. Removes font-weight bold by inheriting
// 2. Matches default `<td>` alignment by inheriting `text-align`.
// 3. Fix alignment for Safari
th {
font-weight: $table-th-font-weight; // 1
text-align: inherit; // 2
text-align: -webkit-match-parent; // 3
}
//
// Forms
//
label {
// Allow labels to use `margin` for spacing.
display: inline-block;
margin-bottom: $label-margin-bottom;
}
// Remove the default `border-radius` that macOS Chrome adds.
//
// Details at https://github.com/twbs/bootstrap/issues/24093
button {
// stylelint-disable-next-line property-disallowed-list
border-radius: 0;
}
// Explicitly remove focus outline in Chromium when it shouldn't be
// visible (e.g. as result of mouse click or touch tap). It already
// should be doing this automatically, but seems to currently be
// confused and applies its very visible two-tone outline anyway.
button:focus:not(:focus-visible) {
outline: 0;
}
input,
button,
select,
optgroup,
textarea {
margin: 0; // Remove the margin in Firefox and Safari
font-family: inherit;
@include font-size(inherit);
line-height: inherit;
}
button,
input {
overflow: visible; // Show the overflow in Edge
}
button,
select {
text-transform: none; // Remove the inheritance of text transform in Firefox
}
// Set the cursor for non-`<button>` buttons
//
// Details at https://github.com/twbs/bootstrap/pull/30562
[role="button"] {
cursor: pointer;
}
// Remove the inheritance of word-wrap in Safari.
//
// Details at https://github.com/twbs/bootstrap/issues/24990
select {
word-wrap: normal;
}
// 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
// controls in Android 4.
// 2. Correct the inability to style clickable types in iOS and Safari.
button,
[type="button"], // 1
[type="reset"],
[type="submit"] {
-webkit-appearance: button; // 2
}
// Opinionated: add "hand" cursor to non-disabled button elements.
@if $enable-pointer-cursor-for-buttons {
button,
[type="button"],
[type="reset"],
[type="submit"] {
&:not(:disabled) {
cursor: pointer;
}
}
}
// Remove inner border and padding from Firefox, but don't restore the outline like Normalize.
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
padding: 0;
border-style: none;
}
input[type="radio"],
input[type="checkbox"] {
box-sizing: border-box; // 1. Add the correct box sizing in IE 10-
padding: 0; // 2. Remove the padding in IE 10-
}
textarea {
overflow: auto; // Remove the default vertical scrollbar in IE.
// Textareas should really only resize vertically so they don't break their (horizontal) containers.
resize: vertical;
}
fieldset {
// Browsers set a default `min-width: min-content;` on fieldsets,
// unlike e.g. `<div>`s, which have `min-width: 0;` by default.
// So we reset that to ensure fieldsets behave more like a standard block element.
// See https://github.com/twbs/bootstrap/issues/12359
// and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements
min-width: 0;
// Reset the default outline behavior of fieldsets so they don't affect page layout.
padding: 0;
margin: 0;
border: 0;
}
// 1. Correct the text wrapping in Edge and IE.
// 2. Correct the color inheritance from `fieldset` elements in IE.
legend {
display: block;
width: 100%;
max-width: 100%; // 1
padding: 0;
margin-bottom: .5rem;
@include font-size(1.5rem);
line-height: inherit;
color: inherit; // 2
white-space: normal; // 1
}
progress {
vertical-align: baseline; // Add the correct vertical alignment in Chrome, Firefox, and Opera.
}
// Correct the cursor style of increment and decrement buttons in Chrome.
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
height: auto;
}
[type="search"] {
// This overrides the extra rounded corners on search inputs in iOS so that our
// `.form-control` class can properly style them. Note that this cannot simply
// be added to `.form-control` as it's not specific enough. For details, see
// https://github.com/twbs/bootstrap/issues/11586.
outline-offset: -2px; // 2. Correct the outline style in Safari.
-webkit-appearance: none;
}
//
// Remove the inner padding in Chrome and Safari on macOS.
//
[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}
//
// 1. Correct the inability to style clickable types in iOS and Safari.
// 2. Change font properties to `inherit` in Safari.
//
::-webkit-file-upload-button {
font: inherit; // 2
-webkit-appearance: button; // 1
}
//
// Correct element displays
//
output {
display: inline-block;
}
summary {
display: list-item; // Add the correct display in all browsers
cursor: pointer;
}
template {
display: none; // Add the correct display in IE
}
// Always hide an element with the `hidden` HTML attribute (from PureCSS).
// Needed for proper display in IE 10-.
[hidden] {
display: none !important;
}
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