[ipfire.org.git] / static / scss / bootstrap-4.0.0-alpha.6 / scss / _reboot.scss

// scss-lint:disable QualifyingElement, DuplicateProperty

// Reboot
//
// Global resets to common HTML elements and more for easier usage by Bootstrap.
// Adds additional rules on top of Normalize.css, including several overrides.


// Reset the box-sizing
//
// Change from `box-sizing: content-box` to `border-box` so that when you add
// `padding` or `border`s to an element, the overall declared `width` does not
// change. For example, `width: 100px;` will always be `100px` despite the
// `border: 10px solid red;` and `padding: 20px;`.
//
// Heads up! This reset may cause conflicts with some third-party widgets. For
// recommendations on resolving such conflicts, see
// https://getbootstrap.com/getting-started/#third-box-sizing.
//
// Credit: https://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/

html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}


// Make viewport responsive
//
// @viewport is needed because IE 10+ doesn't honor <meta name="viewport"> in
// some cases. See https://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/.
// Eventually @viewport will replace <meta name="viewport">.
//
// However, `device-width` is broken on IE 10 on Windows (Phone) 8,
// (see https://timkadlec.com/2013/01/windows-phone-8-and-device-width/ and https://github.com/twbs/bootstrap/issues/10497)
// and the fix for that involves a snippet of JavaScript to sniff the user agent
// and apply some conditional CSS.
//
// See https://getbootstrap.com/getting-started/#support-ie10-width for the relevant hack.
//
// Wrap `@viewport` with `@at-root` for when folks do a nested import (e.g.,
// `.class-name { @import "bootstrap"; }`).
@at-root {
  @-ms-viewport { width: device-width; }
}


//
// Reset HTML, body, and more
//

html {
  // We assume no initial pixel `font-size` for accessibility reasons. This
  // allows web visitors to customize their browser default font-size, making
  // your project more inclusive and accessible to everyone.

  // As a side-effect of setting the @viewport above,
  // IE11 & Edge make the scrollbar overlap the content and automatically hide itself when not in use.
  // Unfortunately, the auto-showing of the scrollbar is sometimes too sensitive,
  // thus making it hard to click on stuff near the right edge of the page.
  // So we add this style to force IE11 & Edge to use a "normal", non-overlapping, non-auto-hiding scrollbar.
  // See https://github.com/twbs/bootstrap/issues/18543
  // and https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7165383/
  -ms-overflow-style: scrollbar;

  // Changes the default tap highlight to be completely transparent in iOS.
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}

body {
  font-family: $font-family-base;
  font-size: $font-size-base;
  font-weight: $font-weight-base;
  line-height: $line-height-base;
  // Go easy on the eyes and use something other than `#000` for text
  color: $body-color;
  // By default, `<body>` has no `background-color` so we set one as a best practice.
  background-color: $body-bg;
}

// Suppress the focus outline on elements that cannot be accessed via keyboard.
// This prevents an unwanted focus outline from appearing around elements that
// might still respond to pointer events.
//
// Credit: https://github.com/suitcss/base
[tabindex="-1"]:focus {
  outline: none !important;
}


//
// 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.
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: .5rem;
}

// 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: 1rem;
}

// Abbreviations
abbr[title],
// Add data-* attribute to help out our tooltip plugin, per https://github.com/twbs/bootstrap/issues/5257
abbr[data-original-title] {
  cursor: help;
}

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;
}


//
// Links
//

a {
  color: $link-color;
  text-decoration: $link-decoration;

  @include hover-focus {
    color: $link-hover-color;
    text-decoration: $link-hover-decoration;
  }
}

// And undo these styles for placeholder links/named anchors (without href)
// which have not been made explicitly keyboard-focusable (without tabindex).
// 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([tabindex]) {
  color: inherit;
  text-decoration: none;

  @include hover-focus {
    color: inherit;
    text-decoration: none;
  }

  &:focus {
    outline: 0;
  }
}


//
// Code
//

pre {
  // Remove browser default top margin
  margin-top: 0;
  // Reset browser default of `1em` to use `rem`s
  margin-bottom: 1rem;
  // Normalize v4 removed this property, causing `<pre>` content to break out of wrapping code snippets
  overflow: auto;
}


//
// Figures
//

figure {
  // Normalize adds `margin` to `figure`s as browsers apply it inconsistently.
  // We reset that to create a better flow in-page.
  margin: 0 0 1rem;
}


//
// Images
//

img {
  // By default, `<img>`s are `inline-block`. This assumes that, and vertically
  // centers them. This won't apply should you reset them to `block` level.
  vertical-align: middle;
  // Note: `<img>`s are deliberately not made responsive by default.
  // For the rationale behind this, see the comments on the `.img-fluid` class.
}


// iOS "clickable elements" fix for role="button"
//
// Fixes "clickability" issue (and more generally, the firing of events such as focus as well)
// for traditionally non-focusable elements with role="button"
// see https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile

[role="button"] {
  cursor: pointer;
}


// Avoid 300ms click delay on touch devices that support the `touch-action` CSS property.
//
// In particular, unlike most other browsers, IE11+Edge on Windows 10 on touch devices and IE Mobile 10-11
// DON'T remove the click delay when `<meta name="viewport" content="width=device-width">` is present.
// However, they DO support removing the click delay via `touch-action: manipulation`.
// See:
// * https://v4-alpha.getbootstrap.com/content/reboot/#click-delay-optimization-for-touch
// * http://caniuse.com/#feat=css-touch-action
// * https://patrickhlauke.github.io/touch/tests/results/#suppressing-300ms-delay

a,
area,
button,
[role="button"],
input,
label,
select,
summary,
textarea {
  touch-action: manipulation;
}


//
// Tables
//

table {
  // No longer part of Normalize since v4
  border-collapse: collapse;
  // Reset for nesting within parents with `background-color`.
  background-color: $table-bg;
}

caption {
  padding-top: $table-cell-padding;
  padding-bottom: $table-cell-padding;
  color: $text-muted;
  text-align: left;
  caption-side: bottom;
}

th {
  // Centered by default, but left-align-ed to match the `td`s below.
  text-align: left;
}


//
// Forms
//

label {
  // Allow labels to use `margin` for spacing.
  display: inline-block;
  margin-bottom: .5rem;
}

// Work around a Firefox/IE bug where the transparent `button` background
// results in a loss of the default `button` focus styles.
//
// Credit: https://github.com/suitcss/base/
button:focus {
  outline: 1px dotted;
  outline: 5px auto -webkit-focus-ring-color;
}

input,
button,
select,
textarea {
  // Normalize includes `font: inherit;`, so `font-family`. `font-size`, etc are
  // properly inherited. However, `line-height` isn't inherited there.
  line-height: inherit;
}

input[type="radio"],
input[type="checkbox"] {
  // Apply a disabled cursor for radios and checkboxes.
  //
  // Note: Neither radios nor checkboxes can be readonly.
  &:disabled {
    cursor: $cursor-disabled;
  }
}


input[type="date"],
input[type="time"],
input[type="datetime-local"],
input[type="month"] {
  // Remove the default appearance of temporal inputs to avoid a Mobile Safari
  // bug where setting a custom line-height prevents text from being vertically
  // centered within the input.
  // See https://bugs.webkit.org/show_bug.cgi?id=139848
  // and https://github.com/twbs/bootstrap/issues/11266
  -webkit-appearance: listbox;
}

textarea {
  // 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;
}

legend {
  // Reset the entire legend element to match the `fieldset`
  display: block;
  width: 100%;
  padding: 0;
  margin-bottom: .5rem;
  font-size: 1.5rem;
  line-height: inherit;
}

input[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.
  -webkit-appearance: none;
}

// todo: needed?
output {
  display: inline-block;
//  font-size: $font-size-base;
//  line-height: $line-height;
//  color: $input-color;
}

// Always hide an element with the `hidden` HTML attribute (from PureCSS).
[hidden] {
  display: none !important;
}
Commit	Line	Data
91e44d91 S	1	// scss-lint:disable QualifyingElement, DuplicateProperty
	2
	3	// Reboot
	4	//
	5	// Global resets to common HTML elements and more for easier usage by Bootstrap.
	6	// Adds additional rules on top of Normalize.css, including several overrides.
	7
	8
	9	// Reset the box-sizing
	10	//
	11	// Change from `box-sizing: content-box` to `border-box` so that when you add
	12	// `padding` or `border`s to an element, the overall declared `width` does not
	13	// change. For example, `width: 100px;` will always be `100px` despite the
	14	// `border: 10px solid red;` and `padding: 20px;`.
	15	//
	16	// Heads up! This reset may cause conflicts with some third-party widgets. For
	17	// recommendations on resolving such conflicts, see
	18	// https://getbootstrap.com/getting-started/#third-box-sizing.
	19	//
	20	// Credit: https://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/
	21
	22	html {
	23	box-sizing: border-box;
	24	}
	25
	26	*,
	27	*::before,
	28	*::after {
	29	box-sizing: inherit;
	30	}
	31
	32
	33	// Make viewport responsive
	34	//
	35	// @viewport is needed because IE 10+ doesn't honor <meta name="viewport"> in
	36	// some cases. See https://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/.
	37	// Eventually @viewport will replace <meta name="viewport">.
	38	//
	39	// However, `device-width` is broken on IE 10 on Windows (Phone) 8,
	40	// (see https://timkadlec.com/2013/01/windows-phone-8-and-device-width/ and https://github.com/twbs/bootstrap/issues/10497)
	41	// and the fix for that involves a snippet of JavaScript to sniff the user agent
	42	// and apply some conditional CSS.
	43	//
	44	// See https://getbootstrap.com/getting-started/#support-ie10-width for the relevant hack.
	45	//
	46	// Wrap `@viewport` with `@at-root` for when folks do a nested import (e.g.,
	47	// `.class-name { @import "bootstrap"; }`).
	48	@at-root {
	49	@-ms-viewport { width: device-width; }
	50	}
	51
	52
	53	//
	54	// Reset HTML, body, and more
	55	//
	56
	57	html {
	58	// We assume no initial pixel `font-size` for accessibility reasons. This
	59	// allows web visitors to customize their browser default font-size, making
	60	// your project more inclusive and accessible to everyone.
	61
	62	// As a side-effect of setting the @viewport above,
	63	// IE11 & Edge make the scrollbar overlap the content and automatically hide itself when not in use.
	64	// Unfortunately, the auto-showing of the scrollbar is sometimes too sensitive,
65	// thus making it hard to click on stuff near the right edge of the page.
66	// So we add this style to force IE11 & Edge to use a "normal", non-overlapping, non-auto-hiding scrollbar.
67	// See https://github.com/twbs/bootstrap/issues/18543
68	// and https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7165383/
69	-ms-overflow-style: scrollbar;
70
71	// Changes the default tap highlight to be completely transparent in iOS.
72	-webkit-tap-highlight-color: rgba(0,0,0,0);
73	}
74
75	body {
76	font-family: $font-family-base;
77	font-size: $font-size-base;
78	font-weight: $font-weight-base;
79	line-height: $line-height-base;
80	// Go easy on the eyes and use something other than `#000` for text
81	color: $body-color;
82	// By default, `<body>` has no `background-color` so we set one as a best practice.
83	background-color: $body-bg;
84	}
85
86	// Suppress the focus outline on elements that cannot be accessed via keyboard.
87	// This prevents an unwanted focus outline from appearing around elements that
88	// might still respond to pointer events.
89	//
90	// Credit: https://github.com/suitcss/base
91	[tabindex="-1"]:focus {
92	outline: none !important;
93	}
94
95
96	//
97	// Typography
98	//
99
100	// Remove top margins from headings
101	//
102	// By default, `<h1>`-`<h6>` all receive top and bottom margins. We nuke the top
103	// margin for easier control within type scales as it avoids margin collapsing.
104	h1, h2, h3, h4, h5, h6 {
105	margin-top: 0;
106	margin-bottom: .5rem;
107	}
108
109	// Reset margins on paragraphs
110	//
111	// Similarly, the top margin on `<p>`s get reset. However, we also reset the
112	// bottom margin to use `rem` units instead of `em`.
113	p {
114	margin-top: 0;
115	margin-bottom: 1rem;
116	}
117
118	// Abbreviations
119	abbr[title],
120	// Add data-* attribute to help out our tooltip plugin, per https://github.com/twbs/bootstrap/issues/5257
121	abbr[data-original-title] {
122	cursor: help;
123	}
124
125	address {
126	margin-bottom: 1rem;
127	font-style: normal;
128	line-height: inherit;
129	}
130
131	ol,
132	ul,
133	dl {
134	margin-top: 0;
135	margin-bottom: 1rem;
136	}
137
138	ol ol,
139	ul ul,
140	ol ul,
141	ul ol {
142	margin-bottom: 0;
143	}
144
145	dt {
146	font-weight: $dt-font-weight;
147	}
148
149	dd {
150	margin-bottom: .5rem;
151	margin-left: 0; // Undo browser default
152	}
153
154	blockquote {
155	margin: 0 0 1rem;
156	}
157
158
159	//
160	// Links
161	//
162
163	a {
164	color: $link-color;
165	text-decoration: $link-decoration;
166
167	@include hover-focus {
168	color: $link-hover-color;
169	text-decoration: $link-hover-decoration;
170	}
171	}
172
173	// And undo these styles for placeholder links/named anchors (without href)
174	// which have not been made explicitly keyboard-focusable (without tabindex).
175	// It would be more straightforward to just use a[href] in previous block, but that
176	// causes specificity issues in many other styles that are too complex to fix.
177	// See https://github.com/twbs/bootstrap/issues/19402
178
179	a:not([href]):not([tabindex]) {
180	color: inherit;
181	text-decoration: none;
182
183	@include hover-focus {
184	color: inherit;
185	text-decoration: none;
186	}
187
188	&:focus {
189	outline: 0;
190	}
191	}
192
193
194	//
195	// Code
196	//
197
198	pre {
199	// Remove browser default top margin
200	margin-top: 0;
201	// Reset browser default of `1em` to use `rem`s
202	margin-bottom: 1rem;
203	// Normalize v4 removed this property, causing `<pre>` content to break out of wrapping code snippets
204	overflow: auto;
205	}
206
207
208	//
209	// Figures
210	//
211
212	figure {
213	// Normalize adds `margin` to `figure`s as browsers apply it inconsistently.
214	// We reset that to create a better flow in-page.
215	margin: 0 0 1rem;
216	}
217
218
219	//
220	// Images
221	//
222
223	img {
224	// By default, `<img>`s are `inline-block`. This assumes that, and vertically
225	// centers them. This won't apply should you reset them to `block` level.
226	vertical-align: middle;
227	// Note: `<img>`s are deliberately not made responsive by default.
228	// For the rationale behind this, see the comments on the `.img-fluid` class.
229	}
230
231
232	// iOS "clickable elements" fix for role="button"
233	//
234	// Fixes "clickability" issue (and more generally, the firing of events such as focus as well)
235	// for traditionally non-focusable elements with role="button"
236	// see https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile
237
238	[role="button"] {
239	cursor: pointer;
240	}
241
242
243	// Avoid 300ms click delay on touch devices that support the `touch-action` CSS property.
244	//
245	// In particular, unlike most other browsers, IE11+Edge on Windows 10 on touch devices and IE Mobile 10-11
246	// DON'T remove the click delay when `<meta name="viewport" content="width=device-width">` is present.
247	// However, they DO support removing the click delay via `touch-action: manipulation`.
248	// See:
249	// * https://v4-alpha.getbootstrap.com/content/reboot/#click-delay-optimization-for-touch
250	// * http://caniuse.com/#feat=css-touch-action
251	// * https://patrickhlauke.github.io/touch/tests/results/#suppressing-300ms-delay
252
253	a,
254	area,
255	button,
256	[role="button"],
257	input,
258	label,
259	select,
260	summary,
261	textarea {
262	touch-action: manipulation;
263	}
264
265
266	//
267	// Tables
268	//
269
270	table {
271	// No longer part of Normalize since v4
272	border-collapse: collapse;
273	// Reset for nesting within parents with `background-color`.
274	background-color: $table-bg;
275	}
276
277	caption {
278	padding-top: $table-cell-padding;
279	padding-bottom: $table-cell-padding;
280	color: $text-muted;
281	text-align: left;
282	caption-side: bottom;
283	}
284
285	th {
286	// Centered by default, but left-align-ed to match the `td`s below.
287	text-align: left;
288	}
289
290
291	//
292	// Forms
293	//
294
295	label {
296	// Allow labels to use `margin` for spacing.
297	display: inline-block;
298	margin-bottom: .5rem;
299	}
300
301	// Work around a Firefox/IE bug where the transparent `button` background
302	// results in a loss of the default `button` focus styles.
303	//
304	// Credit: https://github.com/suitcss/base/
305	button:focus {
306	outline: 1px dotted;
307	outline: 5px auto -webkit-focus-ring-color;
308	}
309
310	input,
311	button,
312	select,
313	textarea {
314	// Normalize includes `font: inherit;`, so `font-family`. `font-size`, etc are
315	// properly inherited. However, `line-height` isn't inherited there.
316	line-height: inherit;
317	}
318
319	input[type="radio"],
320	input[type="checkbox"] {
321	// Apply a disabled cursor for radios and checkboxes.
322	//
323	// Note: Neither radios nor checkboxes can be readonly.
324	&:disabled {
325	cursor: $cursor-disabled;
326	}
327	}
328
329
330	input[type="date"],
331	input[type="time"],
332	input[type="datetime-local"],
333	input[type="month"] {
334	// Remove the default appearance of temporal inputs to avoid a Mobile Safari
335	// bug where setting a custom line-height prevents text from being vertically
336	// centered within the input.
337	// See https://bugs.webkit.org/show_bug.cgi?id=139848
338	// and https://github.com/twbs/bootstrap/issues/11266
339	-webkit-appearance: listbox;
340	}
341
342	textarea {
343	// Textareas should really only resize vertically so they don't break their (horizontal) containers.
344	resize: vertical;
345	}
346
347	fieldset {
348	// Browsers set a default `min-width: min-content;` on fieldsets,
349	// unlike e.g. `<div>`s, which have `min-width: 0;` by default.
350	// So we reset that to ensure fieldsets behave more like a standard block element.
351	// See https://github.com/twbs/bootstrap/issues/12359
352	// and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements
353	min-width: 0;
354	// Reset the default outline behavior of fieldsets so they don't affect page layout.
355	padding: 0;
356	margin: 0;
357	border: 0;
358	}
359
360	legend {
361	// Reset the entire legend element to match the `fieldset`
362	display: block;
363	width: 100%;
364	padding: 0;
365	margin-bottom: .5rem;
366	font-size: 1.5rem;
367	line-height: inherit;
368	}
369
370	input[type="search"] {
371	// This overrides the extra rounded corners on search inputs in iOS so that our
372	// `.form-control` class can properly style them. Note that this cannot simply
373	// be added to `.form-control` as it's not specific enough. For details, see
374	// https://github.com/twbs/bootstrap/issues/11586.
375	-webkit-appearance: none;
376	}
377
378	// todo: needed?
379	output {
380	display: inline-block;
381	// font-size: $font-size-base;
382	// line-height: $line-height;
383	// color: $input-color;
384	}
385
386	// Always hide an element with the `hidden` HTML attribute (from PureCSS).
387	[hidden] {
388	display: none !important;
389	}