1. The "Pre" Tag
The "pre" tag is a hidden HTML gem that can make your code look much cleaner. It preserves line breaks and spaces in text that would otherwise be ignored. This is essential when formatting code blocks or displaying poetry.
2. The "Hidden" Attribute
The "hidden" attribute is an HTML5 feature that allows developers to hide elements from view on web pages.
3. The "Data" Attribute
The "data" attribute is another hidden HTML gem, which can add custom data to elements that aren't visible to users. This can be used to store additional information about an element.
4. The "Picture" Element
The "picture" element is a hidden HTML gem that allows developers to adjust an image's display size and resolution based on different device sizes.
5. The "Details" and "Summary" Elements
The "details" and "summary" elements are hidden HTML gems that allow developers to hide additional information and reveal it when a user clicks on it.