The HTML5 <b> tag is used to specify bold text. It is supported by all major browsers like Safari, Firefox, Opera, Google Chrome and Internet Explorer.

The HTML5 <b> tag is used this way:

This word will be displayed in <b>bold</b>.

According to the HTML5 specifications, the HTML5 <b> tag has to be the last option to use if no other tag is more appropriate to use. The HTML5 specifications specifies that when formatting headings, the <h1> to <h6> headings should be more appropriate to utilize instead of the HTML5 <b> tag.

The HTML5 <b> tag is also capable of supporting the Global Attributes and Event Attributes in HTML5.