Now you are aware about the stacking context, right? Let me once revise what we have seen about stacking context.
- If you have assigned auto value to z-index stacking context, it means that all elements will be in same stacking context.
- If you have assigned an integer or an inherit value to z-index stacking context, it means every time a new stacking context will be created for a new element which will be independent from other stacking contexts.
In the last article, we have discussed auto-valued stacking context. Here, we will see the stacking context which has, other than the auto z-index value of the stacking context. For that let us imagine tables as stacking context.
- What we had is, table and four blocks and two plates of glass and two glass bowls.
- Now, with these imaginary objects, we are going to add some more. Imagine that besides this table there is one more table that has four blocks of the same size and plate of glass on top of that block.
Okay, get it done!! Now imagine the output. What you are expecting on the top in the room? It’s but obvious that the glass bowl on the first table would be on the top because it sits at the highest level with higher z-index.
Let’s think about another scenario. Imagine that the table one is moved and whatever was on the top of it has moved to the basement.
Now what would be on the lower? Again, you will answer that glass bowl would be lower than everything on table two because table one has been moved to a lower level to table two. That is correct.
The same logic applies to the web page content. Let us have one example so that you can have a better understanding.
HTML
If you run the above code and view the output, what will happen? Who would be on the top div.two or div.four? Look at the output below now.
Output:
- div.two sits below to div.four despite of having a greater z-index value. div.two z-index: 100 , div.four x-index: 50 - In the above output image you can see black and yellow borders which represent different stacking contexts each element is in.
Reason:
Well, you can see the law of stacking context to understand this. div.two is contained within div. one, so the z-index of div. two is relative to div. one’s stack. .one-z-index=10 .two-z-index=10.100 .three.z-index=10.150 .four-z-index=50 As you know that we have moved div.one and whatever it holds below div.four. So whatever value of z-index you will set for div. one, it won’t display above the div. four. I wish this would be helpful for you to solve out your dilemma of the z-index property. And now I am sure that you sort out that why an element with a higher z-index ends up displaying behind another element with a lower z-index.
Wrap up:
I wish your sight to z-index now have changed, then before, and now you will be able to understand and create an appropriate design using different stacking context and stacking level. You just need to remind that: “Positioned elements can create new stacking contexts, and the entire stacking levels will display above or below all the levels in another stacking context.”
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Author Bio:
Niral Modi works as a Chief Executive Officer at TOPS Technologies, which is an Education company with an estimated 303 employees; and was founded in 2008. They are part of the Executive team within the C-Suite Department, and their management level is C-Level. Niral is currently based in Chicago, United States.
TOPS Technologies offer the Best Web Designing Course in Nagpur, Hardware Training Classes, Graphic Designing & Web Design Training through Live Project Training. Having tie-ups with 3000+ IT software development companies, We provide a 100% Job Guarantee in Software Development Courses. We are known for our training courses in PHP, Python, Java, Android & iOS, and Asp. Net, C & C++, Angular Courses, IoT, Software Testing, CCNA, Cloud Computing, Ethical Hacking, Hardware Networking, Cyber Security Training, Digital Marketing, MVC Training, and SEO. We also teach Laravel, Nodejs, Unity 3D Game Development, Machine Learning with Python, Data Science, and web designing training.
