Menu
i have some code for example here in html
<html> <body> <img src='an image source'/> <h1>Hi it's test</h1> <div id='mydiv'> <img src='an image source'/> <h1>Hi it's test</h1> </div> </body> </html> if i used the following css code for styling it:
img{ width:100px; height:100px; } h1{ font-size:26px; color:red; } the question is : How can i prevent and isolate the tags inside the mydiv div tag from styling by the public tags style ?
321
The isolation property in CSS is used to define whether an element must create a new stacking content. It prevents an element from acquiring mix-blend-mode from elements in the backdrop by creating a different stack element. Note: Isolate property is applied to the elements parent.
The div tag is multi-purpose – you can use it to do several things on a web page. You'll mostly use it in web layouts and CSS art, but it's super flexible. Ultimately, you'll almost always to use it to style whatever it contains or manipulate such things with JavaScript.
Use the revert keyword to reset a property to the value established by the user-agent stylesheet (or by user styles, if any exist). Use the revert-layer keyword to reset a property to the value established in a previous cascade layer.
If there is any style defined for div tag in your style sheet it will be applied to all div elements. Few things that you can try is don't style with tag name instead give class name and give style declaration to class. so that you can make sure where all styles will go.
The isolation CSS property determines whether an element must create a new stacking context. This property is especially helpful when used in conjunction with mix-blend-mode and z-index. The isolation property is specified as one of the keyword values listed below.
Few things that you can try is don't style with tag name instead give class name and give style declaration to class. so that you can make sure where all styles will go. OR. if you want some specific Div tag to not have the style while other Divs to have. you can always reset it give some different class name or id and reset the style declarations
iframe is also a decent solution for isolation of styles if it doesn't complicate other business logic. Plus this can be done in pure JavaScript and may work in older browsers too.
CSS Cascading and Inheritance Level 3 introduces the all shorthand property and the unset keyword, which, together, allow you to achieve this conveniently.
For example, if an author specifies
all: initialon an element it will block all inheritance and reset all properties, as if no rules appeared in the author, user, or user-agent levels of the cascade.This can be useful for the root element of a "widget" included in a page, which does not wish to inherit the styles of the outer page. Note, however, that any "default" style applied to that element (such as, e.g.
display: blockfrom the UA style sheet on block elements such as<div>) will also be blown away.
You’ll need to apply all: initial to your div and all: unset to its descendants:
#mydiv { all: initial; /* blocking inheritance for all properties */ } #mydiv * { all: unset; /* allowing inheritance within #mydiv */ } You may want to use a class on your div instead of an id, so that any rules you write to style its descendants won’t have to match or beat the high specificity used in this rule.
To be really safe, you may want to block styles on potential pseudo-element descendants too:
#mydiv::before, #mydiv::after, #mydiv *::before, #mydiv *::after { all: unset; } Alternatively, for broader browser support, you can manually attempt to do what all does by setting all known CSS properties (don’t forget the prefixed versions):
#mydiv { /* * using initial for all properties * to totally block inheritance */ align-content: initial; align-items: initial; align-self: initial; alignment-baseline: initial; animation: initial; backface-visibility: initial; background: initial; ... } #mydiv::before, #mydiv::after, #mydiv *, #mydiv *::before, #mydiv *::after { /* * using inherit for normally heritable properties, * and initial for the others, as unset does */ align-content: initial; align-items: initial; align-self: initial; ... color: inherit; ... } You can encourage browser support for the all shorthand property and track its adoption with these issue links:
Up-to-date browser support information for the all shorthand property is available here.
157
Old question, but things have changed a little bit since the accepted answer. There is now a CSSWG-recommended keyword called revert which would be better suited than initial and unset to solve this problem, as it resets properties to what they're defined to in the user agent stylesheet, rather than to their initial value (which has no regard for which element they're used on). So for instance, with revert, a div inside #mydiv will have its display set to block as we would expect and not inline (the initial value of display).
You'd have to do this:
#mydiv, #mydiv::before, #mydiv::after, #mydiv * #mydiv *::before, #mydiv *::after { all: revert; } At the time of writing, revert is supported in Edge, Firefox, Chrome, and Safari, but not IE or Opera.
There is also something else to take into consideration regarding the accepted answer. If you want to style anything inside #mydiv, you need to do so with a selector that is at least as specific as the one you used to unset or revert everything, otherwise it will be overridden by that rule, even if it comes after it in the CSS.
So you'd need to do something like this (note the #mydiv which boost the specificity of the rules):
#mydiv p { margin-top: 20px; } #mydiv .bg-black { background-color: black; } // etc. If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
