Наталия Короткова

Писать CSS просто

#games .header .top .topmenu ul.secondary li a {}

#games div.with-blockquote .block-quote .body-text {}

#games #stepcontent-free.ipadbox {}

#games .left-content-box1 #stepcontent-free.iphonebox {}

#directory-listing#profile {}

#directory-listing-inquiries h4 {}

#directory.contains-box span.verification-link-number {}

#directory#directory-settings ul li span.bullet-directory-listing {}

#directory#directory-not-listed dl dd .city .city-ico {}

#directory-listing-students table.students td.link_body {}

#student-game-activity div.base_row .level-text div.number {}

Это не только

перевод макета в код

Архитектура CSS

  • масштабируемость
  • предсказуемое поведение
  • повторное использование
  • упрощение поддержки кода

web-standards.ru/articles/css-architecture/

Недооценная проблема —

быстрые фиксы

Stylelint

  • поиск ошибок
  • автоматический код-ревью
  • обмен хорошими практиками

Stylelint — как и зачем линтить CSS

Препроцессоры

  • не решают проблемы архитектуры
  • потеря контроля над содержанием (nesting, mixins, extend, циклы и условия)
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled.active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled.focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled:active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled:focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled:hover,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled],
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled].active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled].focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled]:active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled]:focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled]:hover,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled.active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled.focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled:active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled:focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled:hover,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled],
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled].active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled].focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled]:active,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled]:focus,
.main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled]:hover,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled.active,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled.focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled:active,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled:focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled:hover,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled],
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled].active,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled].focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled]:active,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled]:focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled]:hover,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled.active,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled.focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled:active,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled:focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled:hover,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled],
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled].active,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled].focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled]:active,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled]:focus,
.main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled]:hover,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled.active,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled.focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled:active,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled:focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled:hover,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled],
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled].active,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled].focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled]:active,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled]:focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled]:hover,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled.active,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled.focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled:active,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled:focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled:hover,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled],
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled].active,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled].focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled]:active,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled]:focus,
.main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled]:hover,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled.active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled.focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled:active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled:focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.disabled:hover,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled],
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled].active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled].focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled]:active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled]:focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button[disabled]:hover,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled.active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled.focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled:active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled:focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.disabled:hover,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled],
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled].active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled].focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled]:active,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled]:focus,
.payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button[disabled]:hover,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled.active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled.focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled:active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled:focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.disabled:hover,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled],
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled].active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled].focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled]:active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled]:focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button[disabled]:hover,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled.active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled.focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled:active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled:focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.disabled:hover,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled],
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled].active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled].focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled]:active,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled]:focus,
.payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button[disabled]:hover,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled.active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled.focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled:active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled:focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.disabled:hover,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled],
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled].active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled].focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled]:active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled]:focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button[disabled]:hover,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled.active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled.focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled:active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled:focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.disabled:hover,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled],
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled].active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled].focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled]:active,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled]:focus,
.payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button[disabled]:hover,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.active,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button.focus,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button:active,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button:focus,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action .continue-button button:hover,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.active,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.focus,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button:active,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button:focus,
fieldset[disabled] .main.checkout .checkout-row .card.checkout-details .details-holder .action-block .continue-button button:hover,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.active,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button.focus,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button:active,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button:focus,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action .continue-button button:hover,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.active,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button.focus,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button:active,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button:focus,
fieldset[disabled] .main.checkout .checkout-row .card.contact-details .details-holder .action-block .continue-button button:hover,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.active,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button.focus,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button:active,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button:focus,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action .continue-button button:hover,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.active,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button.focus,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button:active,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button:focus,
fieldset[disabled] .main.checkout .checkout-row .card.payment-details .details-holder .action-block .continue-button button:hover,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button.focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button:active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button:focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action .continue-button button:hover,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button.focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button:active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button:focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.checkout-details .details-holder .action-block .continue-button button:hover,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button.focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button:active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button:focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action .continue-button button:hover,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button.focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button:active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button:focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.contact-details .details-holder .action-block .continue-button button:hover,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button.focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button:active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button:focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action .continue-button button:hover,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button.focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button:active,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button:focus,
fieldset[disabled] .payment-details-vouchers .checkout-row .card.payment-details .details-holder .action-block .continue-button button:hover {
  border-color: #F1C933
}

Работа браузера

.block div .link {}
.link
div
div
div
div
.link
.link
html
.block
.block
.link
div
div
div
div
div

Bootstrap

gist.github.com/iAdramelk/d328b73c72cab92ef95f

глобальных

селекторов

> 600

Слабая архитектура

усложнит разработку

Война селекторов

Глобальное пространство имен

.link {
    color: green;
}

Каскад и специфичность

.block .link {
    color: yellow;
}
.block div > .link {
    color: green;
}

.block .link {
    color: yellow;
}

.block a.link {
    color: red;
}

.block div .link {
    color: blue;
}

1)

2)

3)

4)

Специфичность

#nav input[name=tabs]:nth-of-type(1):checked
~ .tabs > div:after {}
  • количество ID в селекторе
  • количество классов, атрибутов и псевдоклассов
  • количество имён элементов и псевдоэлементов

Специфичность

#nav input[name=tabs]:first-child:checked
~ .tabs > div:after {}
#nav
.tabs
[name=tabs]
:last-child
:checked
input
div
:after
#block {}

.block .link {}

a.link {}

Снижение веса

.block {}

.block-link {}

.link {}
[id="block"] {}

.link.link.link.link {}

Хаки

Делайте селекторы

понятнее и быстрее,

выбрасывайте лишнее

!important

 служебные классы

 виджеты

postcss-safe-important

github.com/crimx/postcss-safe-important

!important не исправит

плохой CSS

Наследование

body {
    font-family: Arial, sans-serif;
    font-size: 14px;
}

/*
p { 
  font-family: Arial, sans-serif;
  font-size: 14px;
}
*/
  • не всегда предсказуемо
  • не все свойства наследуются, подробнее в таблице
  • inherit
  • initial
  • unset
  • revert
.wrapper {
  min-height: 100px;
}

.block {
  min-height: inherit;
}

Inherit

.block-link {
  color: inherit;
}

.header .block-link {
  color: pink;
}

.footer .block-link {
  color: blue;
}

Inherit

.block {
    font-weight: 700;
}

.block a {
    font-weight: initial;
}

Initial

.block {
  all: initial;
}

Initial

.block {
  all: unset;
}

Unset

свойство наследуется — inherit

иначе initial

unset сохранит нативное

наследование,

в отличии от initial

* {
  all: unset;
}

Современный сброс стилей?

Мнение Бена Фрейна

Ссылка на Codepen

.block {
  all: revert;
}

Revert

свойство наследуется — inherit

иначе до браузерных стилей

div {
  display: revert;
}

/*
div {
  display: block;
}
*/
div {
  display: unset;
}

/*
div {
  display: inline;
}
*/

Изоляция

Локальный сброс стилей

.block {
  all: initial;
}

postcss-initial

github.com/maximkoretskiy/postcss-initial

Как это работает

.block {
  position: initial;
}
.block {
  position: static;
  position: initial;
}
.block {
  all: initial;
}
.block {
  animation: none 0s ease 0s 1 normal none running;
  backface-visibility: visible;
  background: transparent none repeat 0 0 / auto auto padding-box border-box scroll;
  border: medium none currentColor;
  border-collapse: separate;
  border-image: none;
  border-radius: 0;
  border-spacing: 0;
  bottom: auto;
  box-shadow: none;
  box-sizing: content-box;
  caption-side: top;
  clear: none;
  clip: auto;
  color: #000;
  columns: auto;
  column-count: auto;
  column-fill: balance;
  column-gap: normal;
  column-rule: medium none currentColor;
  column-span: 1;
  column-width: auto;
  content: normal;
  counter-increment: none;
  counter-reset: none;
  cursor: auto;
  direction: ltr;
  display: inline;
  empty-cells: show;
  float: none;
  font-family: serif;
  font-size: medium;
  font-style: normal;
  font-variant: normal;
  font-weight: normal;
  font-stretch: normal;
  line-height: normal;
  height: auto;
  hyphens: none;
  left: auto;
  letter-spacing: normal;
  list-style: disc outside none;
  margin: 0;
  max-height: none;
  max-width: none;
  min-height: 0;
  min-width: 0;
  opacity: 1;
  orphans: 2;
  outline: medium none invert;
  overflow: visible;
  overflow-x: visible;
  overflow-y: visible;
  padding: 0;
  page-break-after: auto;
  page-break-before: auto;
  page-break-inside: auto;
  perspective: none;
  perspective-origin: 50% 50%;
  position: static;
  right: auto;
  tab-size: 8;
  table-layout: auto;
  text-align: left;
  text-align-last: auto;
  text-decoration: none;
  text-indent: 0;
  text-shadow: none;
  text-transform: none;
  top: auto;
  transform: none;
  transform-origin: 50% 50% 0;
  transform-style: flat;
  transition: none 0s ease 0s;
  unicode-bidi: normal;
  vertical-align: baseline;
  visibility: visible;
  white-space: normal;
  widows: 2;
  width: auto;
  word-spacing: normal;
  z-index: auto;
  all: initial;
}

+ gzip

Наследуйте,

когда это нужно

  • БЭМ именование
  • CSS Modules
  • CSS-in-JS

When to use which CSS methodology

Субъективное

Есть мнение

smashingmagazine.com/2016/11/css-inheritance-cascade-global-scope-new-old-worst-best-friends/

CSS Architecture Resource List 

 

Изоляция в CSS

Андрей Ситник

 

Поговорим о верстке: Архитектура

Артур Корнаков

 

Writing Efficient CSS

Joe Reeve

@meuwka

Лапша в CSS

By Nataliya Karatkova

Made with Slides.com

Лапша в CSS

Немного плохого CSS там, немного тут. Проект подрос и отследить «откуда вообще оно взялось» стало невозможно. Внутри команды нет «камикадзе», желающих брать таски по вёрстке. Пришло время подробно разобраться с главными механизмами CSS и писать простой в поддержке код.

  • 2,507

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