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// 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
//
// Change from `box-sizing: content-box` so that `width` is not affected by `padding` or `border`.
*, *::before, *::after { box-sizing: border-box; }
// Root
//
// Ability to the value of the root font sizes, affecting the value of `rem`.
// null by default, thus nothing is generated.
:root { @if $font-size-root != null { @include font-size(var(--#{$prefix}root-font-size)); }
@if $enable-smooth-scroll { @media (prefers-reduced-motion: no-preference) { scroll-behavior: smooth; } } }
// Body
//
// 1. Remove the margin in all browsers.
// 2. As a best practice, apply a default `background-color`.
// 3. Prevent adjustments of font size after orientation changes in iOS.
// 4. Change the default tap highlight to be completely transparent in iOS.
// scss-docs-start reboot-body-rules
body { margin: 0; // 1
font-family: var(--#{$prefix}body-font-family); @include font-size(var(--#{$prefix}body-font-size)); font-weight: var(--#{$prefix}body-font-weight); line-height: var(--#{$prefix}body-line-height); color: var(--#{$prefix}body-color); text-align: var(--#{$prefix}body-text-align); background-color: var(--#{$prefix}body-bg); // 2
-webkit-text-size-adjust: 100%; // 3
-webkit-tap-highlight-color: rgba($black, 0); // 4
} // scss-docs-end reboot-body-rules
// Content grouping
//
// 1. Reset Firefox's gray color
hr { margin: $hr-margin-y 0; color: $hr-color; // 1
border: 0; border-top: $hr-border-width solid $hr-border-color; opacity: $hr-opacity; }
// Typography
//
// 1. 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.
%heading { margin-top: 0; // 1
margin-bottom: $headings-margin-bottom; font-family: $headings-font-family; font-style: $headings-font-style; font-weight: $headings-font-weight; line-height: $headings-line-height; color: var(--#{$prefix}heading-color); }
h1 { @extend %heading; @include font-size($h1-font-size); }
h2 { @extend %heading; @include font-size($h2-font-size); }
h3 { @extend %heading; @include font-size($h3-font-size); }
h4 { @extend %heading; @include font-size($h4-font-size); }
h5 { @extend %heading; @include font-size($h5-font-size); }
h6 { @extend %heading; @include font-size($h6-font-size); }
// 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. Add the correct text decoration in Chrome, Edge, Opera, and Safari.
// 2. Add explicit cursor to indicate changed behavior.
// 3. Prevent the text-decoration to be skipped.
abbr[title] { text-decoration: underline dotted; // 1
cursor: help; // 2
text-decoration-skip-ink: none; // 3
}
// Address
address { margin-bottom: 1rem; font-style: normal; line-height: inherit; }
// Lists
ol, ul { padding-left: 2rem; }
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; }
// 1. Undo browser default
dd { margin-bottom: .5rem; margin-left: 0; // 1
}
// Blockquote
blockquote { margin: 0 0 1rem; }
// Strong
//
// Add the correct font weight in Chrome, Edge, and Safari
b, strong { font-weight: $font-weight-bolder; }
// Small
//
// Add the correct font size in all browsers
small { @include font-size($small-font-size); }
// Mark
mark { padding: $mark-padding; color: var(--#{$prefix}highlight-color); background-color: var(--#{$prefix}highlight-bg); }
// Sub and Sup
//
// Prevent `sub` and `sup` elements from affecting the line height in
// all browsers.
sub, sup { position: relative; @include font-size($sub-sup-font-size); line-height: 0; vertical-align: baseline; }
sub { bottom: -.25em; } sup { top: -.5em; }
// Links
a { color: rgba(var(--#{$prefix}link-color-rgb), var(--#{$prefix}link-opacity, 1)); text-decoration: $link-decoration;
&:hover { --#{$prefix}link-color-rgb: var(--#{$prefix}link-hover-color-rgb); 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]) { &, &:hover { color: inherit; text-decoration: none; } }
// Code
pre, code, kbd, samp { font-family: $font-family-code; @include font-size(1em); // Correct the odd `em` font sizing in all browsers.
}
// 1. Remove browser default top margin
// 2. Reset browser default of `1em` to use `rem`s
// 3. Don't allow content to break outside
pre { display: block; margin-top: 0; // 1
margin-bottom: 1rem; // 2
overflow: auto; // 3
@include font-size($code-font-size); color: $pre-color;
// Account for some code outputs that place code tags in pre tags
code { @include font-size(inherit); color: inherit; word-break: normal; } }
code { @include font-size($code-font-size); color: var(--#{$prefix}code-color); word-wrap: break-word;
// Streamline the style when inside anchors to avoid broken underline and more
a > & { color: inherit; } }
kbd { padding: $kbd-padding-y $kbd-padding-x; @include font-size($kbd-font-size); color: $kbd-color; background-color: $kbd-bg; @include border-radius($border-radius-sm);
kbd { padding: 0; @include font-size(1em); font-weight: $nested-kbd-font-weight; } }
// Figures
//
// Apply a consistent margin strategy (matches our type styles).
figure { margin: 0 0 1rem; }
// Images and content
img, svg { vertical-align: middle; }
// Tables
//
// Prevent double borders
table { caption-side: bottom; border-collapse: collapse; }
caption { padding-top: $table-cell-padding-y; padding-bottom: $table-cell-padding-y; color: $table-caption-color; text-align: left; }
// 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
}
thead, tbody, tfoot, tr, td, th { border-color: inherit; border-style: solid; border-width: 0; }
// Forms
//
// 1. Allow labels to use `margin` for spacing.
label { display: inline-block; // 1
}
// Remove the default `border-radius` that macOS Chrome adds.
// See 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; }
// 1. Remove the margin in Firefox and Safari
input, button, select, optgroup, textarea { margin: 0; // 1
font-family: inherit; @include font-size(inherit); line-height: inherit; }
// Remove the inheritance of text transform in Firefox
button, select { text-transform: none; } // Set the cursor for non-`<button>` buttons
//
// Details at https://github.com/twbs/bootstrap/pull/30562
[role="button"] { cursor: pointer; }
select { // Remove the inheritance of word-wrap in Safari.
// See https://github.com/twbs/bootstrap/issues/24990
word-wrap: normal;
// Undo the opacity change from Chrome
&:disabled { opacity: 1; } }
// Remove the dropdown arrow only from text type inputs built with datalists in Chrome.
// See https://stackoverflow.com/a/54997118
[list]:not([type="date"]):not([type="datetime-local"]):not([type="month"]):not([type="week"]):not([type="time"])::-webkit-calendar-picker-indicator { display: none !important; }
// 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.
// 3. Opinionated: add "hand" cursor to non-disabled button elements.
button, [type="button"], // 1 [type="reset"], [type="submit"] { -webkit-appearance: button; // 2
@if $enable-button-pointers { &:not(:disabled) { cursor: pointer; // 3
} } }
// Remove inner border and padding from Firefox, but don't restore the outline like Normalize.
::-moz-focus-inner { padding: 0; border-style: none; }
// 1. Textareas should really only resize vertically so they don't break their (horizontal) containers.
textarea { resize: vertical; // 1
}
// 1. 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
// 2. Reset the default outline behavior of fieldsets so they don't affect page layout.
fieldset { min-width: 0; // 1
padding: 0; // 2
margin: 0; // 2
border: 0; // 2
}
// 1. By using `float: left`, the legend will behave like a block element.
// This way the border of a fieldset wraps around the legend if present.
// 2. Fix wrapping bug.
// See https://github.com/twbs/bootstrap/issues/29712
legend { float: left; // 1
width: 100%; padding: 0; margin-bottom: $legend-margin-bottom; @include font-size($legend-font-size); font-weight: $legend-font-weight; line-height: inherit;
+ * { clear: left; // 2
} }
// Fix height of inputs with a type of datetime-local, date, month, week, or time
// See https://github.com/twbs/bootstrap/issues/18842
::-webkit-datetime-edit-fields-wrapper, ::-webkit-datetime-edit-text, ::-webkit-datetime-edit-minute, ::-webkit-datetime-edit-hour-field, ::-webkit-datetime-edit-day-field, ::-webkit-datetime-edit-month-field, ::-webkit-datetime-edit-year-field { padding: 0; }
::-webkit-inner-spin-button { height: auto; }
// 1. 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.
// 2. Correct the outline style in Safari.
[type="search"] { -webkit-appearance: textfield; // 1
outline-offset: -2px; // 2
}
// 1. A few input types should stay LTR
// See https://rtlstyling.com/posts/rtl-styling#form-inputs
// 2. RTL only output
// See https://rtlcss.com/learn/usage-guide/control-directives/#raw
/* rtl:raw: [type="tel"], [type="url"], [type="email"], [type="number"] { direction: ltr; } */
// Remove the inner padding in Chrome and Safari on macOS.
::-webkit-search-decoration { -webkit-appearance: none; }
// Remove padding around color pickers in webkit browsers
::-webkit-color-swatch-wrapper { padding: 0; }
// 1. Inherit font family and line height for file input buttons
// 2. Correct the inability to style clickable types in iOS and Safari.
::file-selector-button { font: inherit; // 1
-webkit-appearance: button; // 2
}
// Correct element displays
output { display: inline-block; }
// Remove border from iframe
iframe { border: 0; }
// Summary
//
// 1. Add the correct display in all browsers
summary { display: list-item; // 1
cursor: pointer; }
// Progress
//
// Add the correct vertical alignment in Chrome, Firefox, and Opera.
progress { vertical-align: baseline; }
// Hidden attribute
//
// Always hide an element with the `hidden` HTML attribute.
[hidden] { display: none !important; }
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