HTML Input Types - W3Schools
The <input type="url"> is used for input fields that should contain a URL address. Depending on browser support, the url field can be automatically validated when submitted.
HTML Forms - W3Schools
The <form> element is a container for different types of input elements, such as: text fields, checkboxes, radio buttons, submit buttons, etc. All the different form elements are covered in …
HTML Form Elements - W3Schools
The <input> Element One of the most used form elements is the <input> element. The <input> element can be displayed in several ways, depending on the type attribute.
HTML input tag - W3Schools
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HTML input type Attribute - W3Schools
Definition and Usage The type attribute specifies the type of <input> element to display. If the type attribute is not specified, the default type is "text".
HTML Input Attributes - W3Schools
The input required attribute specifies that an input field must be filled out before submitting the form. The required attribute works with the following input types: text, search, url, tel, email, …
HTML form tag - W3Schools
Definition and Usage The <form> tag is used to create an HTML form for user input. The <form> element can contain one or more of the following form elements: <input> <textarea> <button> …
HTML Input form* Attributes - W3Schools
This chapter describes the different form* attributes for the HTML <input> element.
PHP Form Handling - W3Schools
This page does not contain any form validation, it just shows how you can send and retrieve form data. However, the next pages will show how to process PHP forms with security in mind!
HTML input type="number" - W3Schools
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.