The colspan Attribute in HTML is simply to define how many numbers of columns a cell should take/span in a table. Basically using colspan attribute in HTML tables you are merging the multiple cells. AS MDN docs say: The default value of colspan is 1 and the value must be in non-negative integer. The limitation
The cols attribute indicates the visible width of a textarea. Note: You can also set the height and width of <textarea> by using CSS Tag Support You can use cols attribute on <textarea> tag. Example Browser Support Attribute cols Yes Yes Yes Yes Yes
The class attribute is very important as it is a part of global attribute in HTML and used to allow CSS and JavaScript to select the specific HTML element. In CSS you can use CSS class selectors dot (.) and DOM method in JavaScript like: document.getElementsByClassName. Tag Support You can use class attribute on all
The checked attribute is a boolean attribute and it specifies that an element should be pre-selected (checked) when the page loads. Tip: you can also set checked attribute after page load with using JavaScript. Tag Support You can use checked attribute with <input> tag where input type is checkbox or radio. Example Browser Support Attribute
The autoplay attribute is a boolean attribute and it makes sure that the audio or video will play automatically as soon as possible without stopping. Tag Support You can use this attribute on audio and video HTML tags. Audio Tag Example Video Tag Example Browser Support Element audio 4.0 9.0 3.5 4.0 10.5 video 4.0
autofocus is a boolean attribute and it makes sure that an element will get focus automatically as soon as page loads, unless the user overrides it. This attribute can only be defined by one form-associated component in a document. If there are multiple elements with autofocus attribute, the initial focus will be given to the
The autocomplete attribute indicates that an <input>, <textarea> or <form> tag shout have autocomplete on or off. Autocomplete enables the value to be predicted by the browser. The browser should show suggestions to fill in the field when a user begins typing in a field depending on previously typed numbers, but they may also come
The async attribute specifies that the script will be executed asynchronously as soon as it is available. And It is a boolean attribute. The async attribute is only for external scripts usage and it can be used only if the src attribute is present. Tag Support You can use the async attribute with <script> tag.
The alt attribute provides alternative information for an image if it can not be viewed by a viewer for some reason (because of a poor link, a mistake in the src attribute, or using a screen reader by the user). The <img> tag requires the alt attribute. In <input> elements, the alt attribute can only
The action attribute indicates where to send the form data on submitting the form by the user. (e.g. a PHP script that handles the form data). You can use action attribute on form tag. Example Browser Support
