To implement responsive typography using Bootstrap 3 classes, you can leverage Bootstrap's built-in typography classes and grid system. Here's a concise approach:
Example:
<p class="h1 text-center">This is a responsive heading</p>
<p class="h3 text-center">This is a responsive subheading</p>
<p class="text-justify">This is a responsive paragraph.</p>
Run HTML
Custom CSS for Responsive Font Sizes:
/* Default font size */
p {
  font-size: 16px;
}
/* Adjust font size for smaller screens */
@media (max-width: 768px) {
  p {
    font-size: 14px;
  }
}
/* Adjust font size for larger screens */
@media (min-width: 1200px) {
  p {
    font-size: 18px;
  }
}