<summary>: The Disclosure Summary element
Baseline Widely available *
This feature is well established and works across many devices and browser versions. It’s been available across browsers since январь 2020 г..
* Some parts of this feature may have varying levels of support.
The HTML Disclosure Summary element (<summary>) element specifies a summary, caption, or legend for a <details> element's disclosure box. Clicking the <summary> element toggles the state of the parent <details> element open and closed.
Интерактивный пример
<details> <summary> I have keys but no doors. I have space but no room. You can enter but can’t leave. What am I? </summary> A keyboard. </details> details { border: 1px solid #aaa; border-radius: 4px; padding: 0.5em 0.5em 0; } summary { font-weight: bold; margin: -0.5em -0.5em 0; padding: 0.5em; } details[open] { padding: 0.5em; } details[open] summary { border-bottom: 1px solid #aaa; margin-bottom: 0.5em; } | Permitted content | Phrasing content or one element of Heading content |
|---|---|
| Tag omission | None, both the start tag and the end tag are mandatory. |
| Permitted parents | The <details> element. |
| Permitted ARIA roles | button |
| DOM interface | HTMLElement |
Атрибуты
Этот элемент включает только глобальные атрибуты.
Примечания
Содержимым элемента <summary> может быть любой заголовок, простой текст или HTML, которые можно использовать в абзаце.
Элемент <summary> может быть использован в качестве потомка элемента <details> . Когда пользователь кликает по элементу summary, его родитель - <details> меняет состояние с раскрытого или закрытого на обратное,и тогда toggle event is sent to the <details> element, which can be used to let you know when this state change occurs.
Default label text
If a <details> element's first child is not a <summary> element, the user agent will use a default string (typically "Details") as the label for the disclosure box.
Default style
Per the HTML specification, the default style for <summary> elements includes display: list-item. This makes it possible to change or remove the icon displayed as the disclosure widget next to the label from the default, which is typically a triangle.
You can also change the style to display: block to remove the disclosure triangle.
See the Browser compatibility section for details, as not all browsers support full functionality of this element yet.
Примеры
Below are some examples showing <summary> in use. You can find more examples in the documentation for the <details> element.
Простой пример
A simple example showing the use of <summary> in a <details> element:
<details open> <summary>Overview</summary> <ol> <li>Cash on hand: $500.00</li> <li>Current invoice: $75.30</li> <li>Due date: 5/6/19</li> </ol> </details> Summaries as headings
You can use heading elements in <summary>, like this:
<details open> <summary><h4>Overview</h4></summary> <ol> <li>Cash on hand: $500.00</li> <li>Current invoice: $75.30</li> <li>Due date: 5/6/19</li> </ol> </details> This currently has some spacing issues that could be addressed using CSS.
HTML in summaries
This example adds some semantics to the <summary> element to indicate the label as important:
<details open> <summary><strong>Overview</strong></summary> <ol> <li>Cash on hand: $500.00</li> <li>Current invoice: $75.30</li> <li>Due date: 5/6/19</li> </ol> </details> Спецификации
| Specification |
|---|
| HTML # the-summary-element |