for attribute in html code example

Example 1: html value attribute

<!-- The value attribute is used to for example fill data to an input -->

<input type="text" value="I was already filled" id="textInput">

<!-- The value can be set or copied using JavaScrpit -->
<script>
	// Get your element
	var input = document.getElementById('textInput');
	
	// get the value
	var value = input.value;
	
	// set the value
	input.value = "i was changed";
</script>

Example 2: html lang attribute

The HTML lang attribute is used to identify the language of text content on the web. This information helps search engines return language specific results, and it is also used by screen readers that switch language profiles to provide the correct accent and pronunciation

Syntax
<element lang="language_code">
  
Example
Some French text in a paragraph:

<p lang="fr">Ceci est un paragraphe.</p>

Example 3: syntax for manipulating a class in css

//element
element {
}
//class
.class {
}
//ID
#id {
}
//element and class
element .class {
}
//element with class and decendent
element.class decendent {
}