css.rst
author Oleksandr Gavenko <gavenkoa@gmail.com>
Sat, 28 Jan 2017 14:38:54 +0200
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https://www.w3.org/TR/CSS21/
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.. -*- coding: utf-8; -*-
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=====
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 CSS
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=====
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.. contents::
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   :local:
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CSS specification
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=================
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Starting from CSS level 2 specification splited into individual modules. Each
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module have own levels.
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CSS level 3 means CSS level 2 plus modules that refine and extend CSS 2.
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https://www.w3.org/TR/CSS/
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  Definition of CSS standards.
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https://www.w3.org/Style/CSS/
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  Home page for CSS specification umbrella.
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https://www.w3.org/Style/CSS/current-work
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  Status of all modules.
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https://www.w3.org/TR/CSS2/
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  CSS level 2 at latest rev.
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https://www.w3.org/TR/CSS21/
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  CSS level 2 rev 1.
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Adding CSS to HTML
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==================
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Include to CSS file in ``head`` tag::
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  <html>
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    <head>
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      <link href="path-to.css" rel="stylesheet" type="text/css">
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    </head>
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    ...
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  <html>
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or embed style into ``style`` tag (that tag valid only in ``head`` tag)::
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  <head>
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   <style type="text/css">
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     h1 {border-width: 1; border: solid; text-align: center}
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   </style>
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  </head>
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HTML 5 standard doesn't require ``type`` attribute, above example may be
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rewritten into::
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  <head>
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   <style>
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     h1 {border-width: 1; border: solid; text-align: center}
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   </style>
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  </head>
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To change style of specific tag embedding into ``style`` attribute (style syntax
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doesn't use selectors!)::
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  <b style="color: blue; font-family: ariel">Welcome!</b>
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Selectors
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=========
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::
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  tag {}
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  .class {}
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  #id {} для id разрешены символы
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  * {} - любой элемент
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  tag tag1 {} - выбор tag1, у которых есть предок tag
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  tag > tag {} - выбор дочернего элемента
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  tag + tag {} - выбор соседних элементов
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  tag ~ tag {} - выбор любого соседа
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  [attr] {}
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  [attr1][attr2] {}
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  [attr="..."] {}
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  [attr~="..."] {} - присутствует слово ... в поле атрибута
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  [attr*="..."] {} - присутствует набор символов ... в поле атрибута
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  [attr^="..."] {} - начинается с ... в поле атрибута
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  [attr$="..."] {} - заканчивается на ... в поле атрибута
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  tag [attr|="..."] {}
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  :link - не посещенные ссылки
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  :visited - посещенные ссылки
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  :active - нажатие на левую клавишу мыши на элементе
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  :hover - назначать при наведении
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  :focus - при фокусировке элемента
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  :first-child - первый подэлемент
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  :last-child - последний подэлемент
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  :first-line
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  :first-letter - выбрать первую букву (не приминимо к inline элементам)
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  :before{content:"..."}, ставит перед контентом элементов строку xxx (можно
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  использовать счетчики)
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  :after{} - тоже, что и before, только ставит текст после контента тега
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See:
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 * https://www.w3.org/TR/CSS2/selector.html
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 * https://www.w3.org/TR/css3-selectors/#selectors
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 * https://www.w3.org/TR/CSS/#selectors
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CSS include statement
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=====================
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::
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  @import url("common.css");
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Include statment supports media query syntax::
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  @import url(print.css) print;
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Default style for HTML elements
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===============================
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 * http://www.w3.org/TR/CSS2/sample.html
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Media queries
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=============
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Syntax for media queries inside CSS file is::
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  @media print { ... }
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  @media (min-width: 400px) and (max-width: 600px) { ... }
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  @import url(print.css) print;
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It is possible to link to CSS file with media queries with ``media`` attribute::
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  <link rel="stylesheet" media="(max-width: 640px)" href="max-640px.css">
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  <link rel="stylesheet" media="(min-width: 640px)" href="min-640px.css">
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  <link rel="stylesheet" media="(orientation: portrait)" href="portrait.css">
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  <link rel="stylesheet" media="(orientation: landscape)" href="landscape.css">
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Possible predicates:
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  ``(min-width: VAL)``
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    Rules applied for any browser width over the value defined in the query.
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  ``(max-width: VAL)``
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    Rules applied for any browser width below the value defined in the query.
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  ``(min-height: VAL)``
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    Rules applied for any browser height over the value defined in the query.
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  ``(max-height: VAL)``
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    Rules applied for any browser height below the value defined in the query.
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  ``(orientation=portrait)``
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    Rules applied for any browser where the height is greater than or equal to the width.
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  ``(orientation=landscape)``
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    Rules for any browser where the width is greater than the height.
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See:
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  https://developers.google.com/web/fundamentals/design-and-ui/responsive/fundamentals/use-media-queries
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    Use CSS media queries for responsiveness
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Viewport
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========
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Specs:
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  https://www.w3.org/TR/css-device-adapt/
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    Unpublished: CSS Device Adaptation Module Level 1
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  https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta
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    ``viewport`` attribute in ``meta`` tag.
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  https://developer.mozilla.org/en-US/docs/Mozilla/Mobile/Viewport_meta_tag
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    Firefox mobile support for viewport.
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  https://developer.apple.com/library/safari/documentation/AppleApplications/Reference/SafariWebContent/UsingtheViewport/UsingtheViewport.html
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    Original viewport specs.
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Compatibility:
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  http://www.quirksmode.org/mobile/tableViewport.html
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    Compatibility table.
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  http://viewportsizes.com/
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    Device table with viewport width.
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Articles:
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  http://www.quirksmode.org/mobile/viewports.html
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    How viewports and the widths of various important elements work, such as the
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    ``<html>`` element, as well as the window and the screen.
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  http://www.quirksmode.org/mobile/viewports2.html
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    How viewports and the widths of various important elements work, such as the
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    ``<html>`` element, as well as the window and the screen.
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1920
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CSS compilers
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=============
1535
e499cb39b573 CSS frameworks. CSS compilers.
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  http://lesscss.org/
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                LESS extends CSS with dynamic behavior such as variables,
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                mixins, operations and functions.
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  http://sass-lang.com/
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                Sass is the most mature, stable, and powerful professional grade
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                CSS extension language in the world.
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1920
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CSS browser support
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===================
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  * http://www.quirksmode.org/css/contents.html
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  * http://en.wikipedia.org/wiki/Comparison_of_layout_engines_%28CSS%29
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178383c735a5 CSS specification.
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  * https://www.css3.info/modules/selector-compat/
1920
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Editor support
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==============
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Emacs
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-----
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::
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  $ sudo apt-get install css-mode
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Graphical editor
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----------------
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::
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  $ sudo apt-get install cssed