HTML 5 introduces many more descriptive HTML elements, such as: header, footer, nav, video, article, section, etc.

These elements make HTML easier to read, while helping search engine optimization and accessibility.

The main element enables search engines and developers to find the main content of a web page in an instant.

Form form

input

• placeholder is the predefined text before the user enters anything in the input input input box.
• Set the text input field as required and add the attribute required

<input type="text" placeholder="Cat picture address" required>

button

Submit button:

<button type="submit">this button submits the form</button>

radio single election

• Each radio button should be nested in its own label element.
• All associated radio buttons should have the same name attribute.
• The for attribute and the radio button id attribute have the same value, creating a link between the label element and its child radio buttons.
• Add checked property, default checked item

<label for="indoor">   
    <input id="indoor" type="radio" name="indoor-outdoor" checked>Indoor 
</label>

checkbox check

Same radio

<label for="loving">
    <input id="loving" type="checkbox" name="personality" checked> Loving
</label>

<form action="/submit-cat-photo">
    <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor">indoor</label>
    <label for="outdoor"><input  id="outdoor" type="radio" name="indoor-outdoor">outdoor</label><br>
    <label for="loving"><input  id="loving" type="checkbox" name="personality">loyal</label>
    <label for="loving"><input  id="loving"t type="checkbox" name="personality">lazy</label>
    <label for="loving"><input  id="loving" type="checkbox" name="personality">positive</label><br>
    <input type="text" placeholder="Cat picture address" required>
    <button type="submit">Submission</button>
</form>