1. Autofocus

Indicates that the particular element should be focused on page load. Only one element in the document or dialog may have the autofocus attribute. If applied to multiple elements the first one will receive focus.

2.Inputmode

Hints at the type of data that might be entered by the user while editing the element or its contents. This allows a browser to display an appropriate virtual keyboard.

3.Required

Ensures that the element must be filled out before submitting the form.

4.Autocomplete

Specifies whether the browser has permission to assist to fill out form fields like email, phone numbers, country, etc.

5.Accept

Describes which input file types are allowed. Only used with a file type of the input tag. Takes in a comma-separated list of one or more file types. To allow all files of specific media type, use accept="image/*".

6.Pattern

Specifies a regular expression that the input value is checked against on form submission.

7.Multiple

This attribute allows the user to select multiple values. You can use it with file and email types of input and the select tag.

8.Download

Specifies that the target will be downloaded when the user clicks on the hyperlink.

9.Contenteditable

This attribute allows the user to edit the content of the element.

10.Read-only

Specifies that an input field is read-only. A user can still tab to it, highlight it, and copy the text from it. To forbid those actions, use the disabled attribute, instead.

11.Hidden

Specifies whether or not the element is visible.

12.Spellcheck

Defines whether the element is checked for spelling errors. Typically, all the non-editable elements are not checked, even if the spellcheck attribute is set to true and the browser supports spellchecking.

13.Translate

Specifies whether the element should be translated when the page is localized. An example use case would be your company name, book titles, locations, etc.

14.lazy

Specifies whether a browser should load an image immediately or defer the loading of off-screen images until, for example, the user scrolls near them. Eager is the default behavior, and lazy is used to defer (aka lazy loading).

15.Poster

Allows adding an image to be shown while the video is downloading. If not specified, nothing is displayed until the first frame is available, then the first frame is shown as the poster frame.

16.Controls

Specifies whether or not the audio/video controls should be displayed on the player.

17.Autoplay

Ensures that the audio/video will automatically start playing as soon as it is loaded.

18.Loop

Specifies that the audio/video will start over again, every time it is finished.

19.Cite

Points to where the content is taken from, or change or deletion is referred.

20.Async

Ensures the script is executed asynchronously with the rest of the page. The async attribute only affects external scripts (src attribute must be present).

21.Defer

Ensures the script is executed when the page has finished parsing. The defer attribute only affects external scripts (src attribute must be present).

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