How to insert logo into navbar-brand ?

Instead of having just brandLabel text in my navbar, I would like to insert logo there. From reading the documentation for yii\bootstrap\NavBar, I do not see how this can be done. Can someone help please ?

According to the docs, brandLabel is not HTML encoded, so you can put an image tag in there.

I have tried this:

'brandLabel' => Html::img('logo.png'),

But image is not displayed, I get only empty box, but once I click on it image is displayed. What am I doing wrong ?

Try to add slash

'brandLabel' => Html::img('/logo.png'),

Just give it a width property. I got tricked for a minute too.