How to Prevent Inheritance of CSS Styles Inside a Specific Div?

Isolating a div from Public CSS Styles

Problem:

In the provided HTML code, the CSS styles applied to img and h1 elements are also impacting the elements within the #mydiv div. How can this inheritance be prevented?

Solution:

Using the all Shorthand Property:

CSS Level 3 introduces the all shorthand property, which allows you to reset all properties of an element. By setting all: initial on the #mydiv div, all styles inherited from its ancestors will be blocked.

To allow for styling within the #mydiv div, apply all: unset to its descendants. This will enable inheritance within the div while preventing external CSS from affecting it.

<code class="css">#mydiv {
  all: initial;
}
#mydiv * {
  all: unset;
}</code>

Manually Setting Individual Properties:

For broader browser support, manually set all known CSS properties to initial for the #mydiv div and inherit or initial for its descendants as applicable. This simulates the behavior of the all property.

Additional Considerations:

• Consider using a class on the div instead of an ID for greater specificity control.
• Block styles on potential pseudo-element descendants to ensure complete isolation.
• Monitor browser support for the all shorthand property, as it is not yet universally supported.

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