HTML <summary> Tag Definition, Usage and Example

The <summary> HTML Tag, defines a given visible header for <details> element. The details can be viewed or hidden by clicking the heading. To summarize the information in the <details> element, HTML uses the <summary> HTML Tag. There should be a <summary> HTML Tag below of the <details> element.The <summary> HTML Tag, although optional, is helpful when working with many <details> elements, as each <summary> HTML Tag can give an instructive legend that identifies each <details> element. The <summary> HTML Tag is part of the Styles and Semantics HTML category in HTML Element Reference.The attributes of the <summary> HTML Tag are global and event attributes. 

<summary> code block example to learn how it works is given below.

<summary>Click to open</summary>
<p>Collapsible content...</p>

The second example usage of the “<summary>” code block example is given below.

<summary>Holisticseo Summary</summary>  
<p> Holisticseo is a well-known online resource.</p>  
<p>On Holisticseo, you can find lessons on a wide range of topics, including HTTP, HTML, CSS, and more.</p>  

What is <summary> HTML Tag

The <details> element can be utilized in combination with the <summary> HTML Tag to specify a summary or legend. The details of this summary or legend can be expanded or collapsed by clicking on it. When a user clicks on the summary, previously hidden content in the <details> element becomes available.

How to Use <summary> HTML Tag?

To use the <summary> HTML Tag, the web developer should write the <summary></summary> with summary or legend placed in between the start and end tags. The web developer should placed the <summary> HTML Tag right after the <details> HTML Tag as the <summary> HTML Tag element must be the first child.

Example Usage of <summary> HTML Tag?

The following examples of usage of <summary> HTML Tag are given below.

  <summary>Samsung Book Pro Specification</summary>    
      <li><strong>291.3x199.8x7.4 mm aluminum body; 754g (Wi-Fi and LTE) display</strong> with 2-in-1 form factor with a detachable keyboard; S Pen stylus; both included</li>    
      <li><strong>7th Gen Intel Core i5 processor, Dual Core 3.1GHz</strong> with 4GB/8GB RAM; 128GB/256GB eMMC</li>    
      <li><strong>microSD up to 256GB</strong> with 39W battery; up to 10.5hrs, Fast Charging support</li>    
      <li><strong>Wi-Fi 802.11 a/b/g/n/ac, 2X2 MIMO; LTE Cat. 6; Bluetooth® 4.1 BLE;(Type-C);</strong> GPS + GLONASS; 2x USB 3.1</li>    
      <li><strong>Windows 10 OS</strong> 13MP Auto focus + 5MP fixed camera</li>    
<summary>Cultural Center of the Philippines</summary>
  <p>Cultural Center of the Philippines was founded in 1969 and has been putting on shows featuring Philippine music, dance, theater, visual art, literature, film, and design.</p>

What are the Attributes of <summary> HTML Tag?

There are multiple attributes for the <summary> HTML Tag. The following attributes are listed below.

  • Global Attributes: The <summary> HTML Tag supports the global attributes. All HTML elements, even those not specified in the standard, can have global attributes. This means that any non-standard elements must nevertheless allow certain characteristics, even if using such elements makes the content non-HTML5 compliant.
  • Event Attributes: The <summary> HTML Tag supports the event attributes. The Event Attributes always have a name that begins with “on” and is followed by the name of the event for which it is intended. They specify a script to run when an event of the defined type is dispatched to the element with the specified attributes.

What are the Default CSS Settings for <summary> HTML Tag?

The following are the Default CSS Settings for the <summary> HTML Tag. Some examples are listed below this document.

details {
    border: 1px solid #aaa;
    border-radius: 4px;
    padding: .5em .5em 0;
summary {
    font-weight: bold;
    margin: -.5em -.5em 0;
    padding: .5em;
details[open] {
    padding: .5em;
details[open] summary {
    border-bottom: 1px solid #aaa;
    margin-bottom: .5em;

What are the Related other HTML Tags to <summary>?

The other related HTML Tags to the <summary> HTML Tag are listed below.

  • <main> HTML Tag: The <main> HTML Tag and <summary> HTML Tag are related because they are both style and semantics HTML Tags. It specifies the document’s primary content using the <main> HTML Tag.
  • <header> HTML Tag: The <header> HTML Tag and <summary> HTML Tag are related because they are both style and semantics HTML Tag. The <header> HTML Tags specifies a header for a page or portion of content.
  • <details> HTML Tag: The <details> HTML Tag and <summary> HTML Tag are related because they are both style and semantics HTML Tags. The <details> HTML Tag specifies additional information that the user can either display or hide.
  • <data> HTML Tag: The <data> HTML Tag and <summary> HTML Tag are related because they are both style and semantics HTML Tags. Content can be translated into machine-readable form using an HTML Tag that is known as the <data> HTML Tag.
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