Html 简明教程

Attribute

Description

Example

accept

The HTML accept attribute is used to describe what file type the user should be allowed to select from a file input dialog box.

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accept-charset

The HTML accept-charset attribute is used to specify the character encodings that are to be used for the form submission.

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action

The HTML action attribute is used to specify a URL that processes the form submission.

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align

The alignment of content within an HTML element, such as images or tables, was specified by the HTML align attribute.

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alt

The alt attribute is essential for supplying alternative text for images, facilitating accessibility, and improving user experience.

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async

The HTML async attribute is a Boolean attribute that is used to specify the script to execute/run as soon as it’s loaded.

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autofocus

The HTML autofocus attribute is a boolean attribute that is used to specify that an element should be autofocused after the page has loaded.

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bgcolor

The HTML bgcolor attribute or property is used to represent the background color of elements.

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border

The border of an HTML element, such as tables and images, can be specified using the HTML border attribute.

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charset

The HTML charset attribute is used for the character encoding in the HTML document.

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checked

The HTML checked attribute is a boolean attribute that indicates whether a checkbox is checked by default (when the page loads).

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class

One or more classes can be specified for an HTML element using the class attribute, which is a fundamental element.

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color

The HTML color attribute is used to set the text color of the font element.

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cols

The HTML cols attribute is used to set or specify the visible width of a text area element.

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colspan

The HTML colspan attribute is used to define how many table columns a cell should span or extend.

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content

The HTML content attribute is used to display/contain the value for the name or HTTP-equiv attribute, depending on which is used.

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coords

The HTML coords attribute is used to specify/set the coordinates of an area in an image map.

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data

The HTML data attribute is used to specify the URL for the resource.

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datetime

The HTML datetime attribute is used to indicate the date and time associated with the element.

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default

The HTML default attribute is a boolean attribute that is used to indicate that a track should be enabled unless the user’s preferences indicate that another track is more appropriate.

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defer

The HTML defer attribute is a boolean attribute that specifies that the script is downloaded parallel to parsing the page, and is executed after parsing the page.

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dirname

The HTML dirname attribute is used to enable the submission of the directionality of the element.

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disabled

The HTML disabled attribute is used to specify that the element is disabled.

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download

The HTML download attribute is used to specify that the resource( the file or resource specified in the href attribute) will be downloaded when a user clicks on the hyperlink.

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enctype

The HTML enctype attribute is used to specify how the form input data should be encoded before sending it to the server.

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formaction

The HTML formaction attribute is used to specify an URL of the file that will process the input controls and redirect to a different page when the form is submitted.

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headers

The HTML header attribute is used to specify a table cell that contains the header information for the current data cell.

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height

In HTML, the height attribute is frequently used to specify the vertical dimension in pixels of an element, such as an image or an iframe.

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high

The HTML high attribute is used to specify the lower bound of an upper range.

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href

The HTML href attribute is used to specify the URL that a hyperlink points to.

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hreflang

The HTML hreflang attribute is used to specify the language of the linked document or URL.

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httpequiv

The HTML http-equiv attribute is used to define the pragma directive.

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id

An HTML element that is used to identify an HTML element on a webpage is the id attribute.

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ismap

The HTML ismap attribute is a Boolean attribute that is used to specify that the image is part of a server-side image map.

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kind

The HTML kind attribute is used to specify the kind of text track for the audio/video.

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list

The HTML list attribute refers to the datalist element that contains the predefined options for an input element.

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low

The HTML low attribute indicates the upper limit of the lower range.

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max

The HTML max attribute is used to define the maximum value that is acceptable and valid for an input field.

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maxlength

The HTML maxlength attribute is used to define the maximum number of characters the user can enter into an ‘input’ and ‘textarea’ field.

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media

The HTML media attribute is used to specify a hint of the media for which the linked resource was designed.

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method

The HTML method attribute is used to define which HTTP method to use when submitting the form.

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minlength

The HTML minlength attribute is used to define the minimum number of characters that a user can enter into an 'input' or 'textarea' field.

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min

For input elements such as <input type="number">, <input type="date">, or <input type="time">, the min attribute in HTML is used to define the minimal value.

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multiple

The HTML multiple attribute is a Boolean attribute, and if present, it allows form controls to accept more than one value.

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name

The HTML name attribute is used to specify the name of an element.

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open

The open attribute is an HTML attribute that indicates or specifies whether the details, that is, the contents of the <details> element, are currently visible.

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optimum

The optimum is an HTML attribute that specifies the range where the gauge’s (to determine the capacity of contents or estimate a judge’s) value is considered to be an optimal value.

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pattern

The HTML pattern attribute is usually used with input elements, particularly text fields like input and textarea.

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placeholder

The HTML placeholder attribute is used to define a short hint that helps the user with data entry.

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poster

The HTML poster attribute is used to specify an image/poster for the video.

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readonly

The HTML readonly attribute is used to specify that an input, or textarea field, is read-only.

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rel

The rel is an HTML attribute that specifies the relationship between the current document and the linked document or resource.

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required

The HTML required attribute is a boolean attribute. It is used to specify that an input field must be filled by users before submitting the form.

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reversed

This attribute can be helpful when you want to show a countdown or sort items by decreasing value.

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rows

The rows is an HTML attribute that is used to specify the height of the textarea in lines.

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rowspan

The rowspan is an HTML attribute that specifies the number of rows spanned by a cell or grid cell within a table or grid.

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sandbox

The sandbox is an HTML attribute that stops a document loaded in an iframe from using certain features (such as submitting forms or opening new windows).

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scope

The scope is an HTML attribute that is used to define the header cell.

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selected

In HTML, to choose element’s options from a dropdown menu are utilized using the selected attribute.

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shape

The shape is an HTML attribute used to specify an area’s shape.

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size

The size is an HTML attribute that is used to specify the initial width of the input field and the number of visible rows for the selected element.

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sizes

The sizes is an HTML attribute that specifies the sizes of the linked resources. It is used to provide the sizes of icons for visual media.

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src

The HTML src attribute is used to represent external resources such as images, videos, audio, and URLs in the page from the external or device resource.

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span

The span attribute is an HTML attribute that specifies the number of columns a <col> or <colgroup> element should span.

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srcdoc

The srcdoc is an HTML attribute that specifies the HTML content on the page to show in the inline frame.

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srclang

The srclang attribute is an HTML attribute that is used to specify the language of the track text.

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srcset

The srcset is an HTML attribute that is used to specify the URL of an image to use in different situations.

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start

The start attribute is an HTML attribute that specifies the initial value of the ordered list in numeric form.

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step

It is used to set the interval between legal numbers or the distinct step size of the <input> tag.

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style

The HTML style attribute contains a CSS styling declaration and is used to apply it to an element.

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target

The target is an HTML attribute that is used to specify where to open the linked document.

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type

The type is an HTML attribute that specifies the type of element.

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usemap

The usemap is an HTML attribute that creates relationships between <img> and <map> by specifying an image or an object with clickable areas.

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value

For various form elements like input fields, checkboxes, radio buttons, and select options, the initial or default value is specified using the HTML value attribute.

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width

The width of an element can be specified in pixels or as a percentage of its parent container using the HTML width attribute.

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wrap

The wrap attribute of HTML ref is used to wrap the text in a text area when submitted in a HTML form.

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Attribute

Description

Example

accesskey

The accesskey is a global attribute that provides a hint for generating a keyboard shortcut for the current element.

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class

The class is a global attribute that is used to specify the class name for the current element or tag.

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contenteditable

The contenteditable attribute is an HTML global attribute that specifies or indicates whether or not the content present in the browser is editable by the user.

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data-*

Used to store custom data associated with the element.

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dir

The dir attribute is used to control the text direction in websites.

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draggable

The draggable is an HTML global attribute that is used to specify whether an element is draggable or not.

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hidden

The Hidden HTML Global attribute indicates that the content of an element should not be displayed to the user.

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id

The id is an HTML global attribute that defines an identifier (id) that must be unique in the whole HTML document.

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lang

The lang attribute is an HTML Global attribute that is used to define the language of an element’s content.

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spellcheck

Several elements, including text input fields and contenteditable elements, can have the spellcheck global attribute applied to them in HTML.

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style

A global attribute in HTML called style enables programmers to apply inline CSS styles to HTML elements.

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tabindex

Specifies the tab order of an element.

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title

A text to display in a tool tip.

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translate

A global attribute called translate was created to facilitate the translation and internationalization of web content.

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