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The HTML syntax allows a variety of equally valid ways to specify attributes, as discussed in §8 The HTML syntax.For example, if the customer entered "Denise Lawrence" as their name, "555-321-8642" as their telephone number, did not specify an e-mail address, asked for a medium-sized pizza, selected the Extra Cheese and Mushroom toppings, entered a delivery time of 7pm, and left the delivery instructions text field blank, the user agent would submit the following to the online Web service: Forms can be annotated in such a way that the user agent will check the user’s input before the form is submitted.For example, a page that forms part of a checkout process on an e-commerce site for a customer buying a gift to be shipped to a friend might need both the buyer’s telephone number (in case of payment issues) and the friend’s telephone number (in case of delivery issues).If the site expects international phone numbers (with the country code prefix), this could thus look like this: In this pizza delivery example, the times are specified in the format "HH: MM": two digits for the hour, in 24-hour format, and two digits for the time.This pizzeria only delivers between 11am and 9pm, and doesn’t promise anything better than 15 minute increments, which we can mark up as follows: attribute.For each form control you want submitted, you then have to give a name that will be used to refer to the data in the submission.It is used to persist names of controls even when they change names.The supported property names consist of the names obtained from the following algorithm, in the order obtained from this algorithm: attribute may be specified to indicate a form control with which the caption is to be associated.
Choosing between different values of this attribute is the same choice as choosing what the label for the element will be. If a page is asking for a telephone number from the user, the right form control to use is value to use depends on which phone number the page is asking for, whether they expect a telephone number in the international format or just the local format, and so forth.A form is a component of a Web page that has form controls, such as text fields, buttons, checkboxes, range controls, or color pickers.A user can interact with such a form, providing data that can then be sent to the server for further processing (e.g., returning the results of a search or calculation).Similarly, after the user inputs a time, date, or number using their preferred format, the user agent converts it back to the wire format before putting it in the DOM or submitting it.
This allows scripts in pages and on servers to process times, dates, and numbers in a consistent manner without needing to support dozens of different formats, while still supporting the users' needs.
In France, it is common to use the 24-hour clock, and separate the hours from the minutes using an "h" character, as in "14h00".