Здравствуйте! Сегодня я хочу рассказать Вам про каскадные таблицы стилей css. Эта технология стала использоваться 1996 году. Несмотря на то, что css существует уже долго, ее практическое применение долгое время сводилось к управлению шрифтом и цветом, так как в css было ограничение на совместимость поддержки таблиц стилей браузером. Сейчас поддержка языка css организована гораздо лучше. Сейчас веб дизайнеры переходят к дизайну, где в полной мере применяют язык css. Еще одна причина популярности css – это поддержка многими браузерами.
В чем преимущества такого использования?
- Уменьшение размера самого документа. Это позволяет уменьшить его загрузку.
- Использование css позволяет управлять огромным количеством документов, редактируя только один файл с описанием стилей.
- документы css кэшируются
Давайте рассмотрим такой вопрос. Почему они называются каскадными? Потому что каскад, это ни что иное, как иерархия применения. Система применения правил.
Каскад определяет способ применения этих правил. Типы таблиц стилей:
1. Пользовательский стиль определяет все стили;
2. Встроенный - превосходит внедренный, связанный и импортированный стили;
3. Внедренный – имеет преимущество перед встроенным;
4. Связанные и импортированные стили – применяются везде, где не были применены другие стили;
На данный момент мы можем использовать шесть таблиц стилей:
1. Стиль браузера. Это стандартная таблица стилей. Если мы специально не задаем определенные стили, то будут использоваться эти стандартные.
2. Стиль пользователя. Каждый может написать свою собственную таблицу стилей и ее использовать, изменив настройки браузера.
3. Встроенный стиль. Определяется с использованием атрибута style.
4. Внедренный стиль. Размещается внутри html документа.
5. Связанный стиль. Связуется с документом при помощи элемента link. Он размещен в разделе head.
6. Импортированный стиль. Позволяет импортировать стили.
Так же хочу Вас уверить, что изучение технологи css, представляет очень большие возможности, при оформлении внешнего вида Вашего сайта. Также позволяют оптимизировать и ускорить процесс загрузки сайта.
Мы делаем классные сайты на css.
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