The HTML<b> tag is used to highlight in bold that part of the text, which we want to make more obvious for the user. The <b> tag only highlights the part of the text, it has no semantic load (including for search engines).

In HTML 5 it’s recommended to use the <b> tag only as a last resort, when it is not possible to use other tags.

Avoid using the <b> tag for titles and headings.Instead, you can use the <h1> - <h6> tags. It’s preferable to use this tag for marking keywords, product names or other spans of the text.


The <b> tag comes in pairs. The content is written between the opening (<b>) and closing (</b>) tags.

Example of the HTML <b> tag:

<!DOCTYPE html>
    <title>Title of the document </title>
    <p><b>This section of the text </b> has been extracted in bold,</p>


b tag example

The appearance of the content of the <b> container is defined by default, but the bold style can be changed by the help of CSS.

The CSS font-weight property also can be used to set bold text.

Example of the font-weight property for making the text bold:

<!DOCTYPE html>
    <title>Title of the document </title>
      .bold-text {
        font-weight: 700;
      <span class="bold-text">This section of the text </span> 
      has been extracted in bold.

<b> vs <strong>

Both the <b> and <strong> elements render the text in a bold typeface. The difference between them is that the <strong> tag stands for a text of a certain importance, but the <b> tag contain any information about the text. However, it’s better to avoid the <b> tag. Instead, you can use the "bold" value of the CSS font-weight property.


The <b> tag supports the Global Attributes and the Event Attributes.

How to style <b> tag?

Common properties to alter the visual weight/emphasis/size of text in <b> tag:

  • CSS font-style property sets the style of the font. normal | italic | oblique | initial | inherit.
  • CSS font-family property specifies a prioritized list of one or more font family names and/or generic family names for the selected element.
  • CSS font-size property sets the size of the font.
  • CSS font-weight property defines whether the font should be bold or thick.
  • CSS text-transform property controls text case and capitalization.
  • CSS text-decoration property specifies the decoration added to text, and is a shorthand property for text-decoration-line, text-decoration-color, text-decoration-style.

Coloring text in <b> tag:

  • CSS color property describes the color of the text content and text decorations.
  • CSS background-color property sets the background color of an element.

Text layout styles for <b> tag:

  • CSS text-indent property specifies the indentation of the first line in a text block.
  • CSS text-overflow property specifies how overflowed content that is not displayed should be signalled to the user.
  • CSS white-space property specifies how white-space inside an element is handled.
  • CSS word-break property specifies where the lines should be broken.

Other properties worth looking at for <b> tag:

Browser support

chrome edge firefox safari opera

Practice Your Knowledge

What is the function of the HTML <b> tag?

Quiz Time: Test Your Skills!

Ready to challenge what you've learned? Dive into our interactive quizzes for a deeper understanding and a fun way to reinforce your knowledge.

Do you find this helpful?