Applying Magento 2 library tooltip to custom theme

This should work tested on 2.1.8

<span class="demo-tooltip">
    <a href="#" class="tooltip-toggle">Hover?</a>
    <span class="tooltip-content">Demo text here</span>
</span>

Add following code is in less file.

.demo-tooltip {
    .lib-tooltip(right);
}

And run php bin/magento setup:upgrade command.

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