How to Change Font-Size of a Tag Using Inline CSS

How to change font-size of a tag using inline css?

Strange it doesn't change, as inline styles are most specific, if style sheet has !important declared, it wont over ride, try this and see

<span style="font-size: 11px !important; color: #aaaaaa;">Hello</span>

How to change font-size for text within an a tag in HTML

You are using the font awesome wrong. They always use the < i > tag for that so you won't have to separate it with css so this is how the html should look:

a {  font-size:20px;}
a i {   font-size:25px;}

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<a href="https://www.facebook.com/username/">   <i class="fa fa-facebook"></i> @username</a><a href="https://www.instagram.com/username/">   <i class="fa fa-instagram"></i> @username</a>

setting color and font-size inline in HTML4?

Please check this out.

<p style="color:#ff0000; font-size:12px;">

you can check by reducing font site or can write like this for forcefully apply style in html element:

<p style="color:#ff0000; font-size:12px !important;">

How to get font size specified in inline style

The jQuery .css() method returns the computed style property.

Since you want to get the value that was specified in the inline style attribute, you could access the fontSize property on the element's style property directly in order to get 12pt.

var element = document.getElementById('_QNU0OVBMB'),    fontSize = element.style.fontSize;
alert(fontSize); // 12pt

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="_QNU0OVBMB" style="font-size:12pt">  m.FIRMA</div>

how to change the font size of h2 tag in the html

There are multiple ways to do this
1. Using inline css
just do

<h2 style="font-size:40px !important;"></h2>

2. Using Internal css

<style>
h2{
 font-size:40px !important;
}
</style>

3. Using External css

just assign a class to your h2 element and add size to that class on external css

<h2 class="headding"></h2>

and then

.headding{
   font-size:40px !important;
}

you can use size like **40px,40%,40vw,**etc.

How to get element font-size inline style when there is more than 1 font-size css

How abaout reading it manually from style tag:

var fontSize = $('.link-item').attr('style').match(/font-size:\s*(.*?);/)[1];

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