* Use cases: database entry forms creation, professional website development, web-scraping and API search strategy for meta-analysis.
https://docs.google.com/spreadsheets/d/1pKwYnt68I8ZmZWGbyREO3VkNx60XqrcAyD7lkxJ77tc/edit?gid=0#gid=0
<form action = "/action_page.php" target = "_blank">
<label for = "first_author">First author </label><br>
<input type = "text" id = "first_author" name = "first_author" value = "Kim"><br>
<input type="radio"><br>
<input type="checkbox"><br>
<input type="submit"><br>
<input type="button"><br>
<input type="color"><br>
</form><br>
```html
<input type="button"><br>
<input type="checkbox"><br>
<input type="color"><br>
<input type="date"><br>
<input type="datetime-local"><br>
<input type="email"><br>
<input type="file"><br>
<input type="hidden"><br>
<input type="image"><br>
<input type="month"><br>
<input type="number"><br>
<input type="password"><br>
<input type="radio"><br>
<input type="range"><br>
<input type="reset"><br>
<input type="search"><br>
<input type="submit"><br>
<input type="tel"><br>
<input type="text"><br>
<input type="time"><br>
<input type="url"><br>
<input type="week"><br>
```
```html
<form> Defines an HTML form for user input
<input> Defines an input control
<textarea> Defines a multiline input control (text area)
<label> Defines a label for an <input> element
<fieldset> Groups related elements in a form
<legend> Defines a caption for a <fieldset> element
<select> Defines a drop-down list
<optgroup> Defines a group of related options in a drop-down list
<option> Defines an option in a drop-down list
<button> Defines a clickable button
<datalist> Specifies a list of pre-defined options for input controls
<output> Defines the result of a calculation
```
<form>
<label for="files">Select files:</label>
<input type="file" id="files" name="files" multiple>
</form>
<form>
<label for="country_code">Country code:</label>
<input type="text" id="country_code" name="country_code"
pattern="[A-Za-z]{3}" title="Three letter country code">
</form>