Here's an example of HTML that includes the <blink> tag:

It's important to note that the <blink> tag is obsolete and not supported by modern web browsers. In the example above, I've included both the obsolete <blink> tag and a CSS-based alternative that achieves a similar blinking effect.

The CSS-based blinking effect is created using an animation that alternates the opacity of the text. This is a more modern and widely supported approach to create a blinking effect, although it's generally advised to use such effects sparingly as they can be distracting or problematic for accessibility.