Here is my CSS code snippet:
.bloodparam > .highvalue { bottom: 12px; right: 25%; }
and
.bloodparam > .highvalue { bottom: 12px; left: 75%; }
I expected the element to be in the same position with both lines of code, but I'm noticing differences. Any thoughts on why this might be happening?
To see the issue for yourself, check out this fiddle http://jsfiddle.net/956y5/1/ - You'll notice that the right indicator varies between the first and second lines.
left position values are determined from the specified left value and place the width to the right of that point.
right position values are calculated based on the specified right value and position the width to the left of the location.
You can visually observe this in your example, where the right side of the top 100 aligns with the left side of the bottom one.
This logic is important. For instance, if left:0 and right:0 were deemed equivalent, the left version would be on the far left with full width visible, while the right version would be at the far right and out of view. Instead, it correctly displays the element with its complete width towards the right-most edge.
In truth, both values are slightly incorrect because left and right consider the width of the element being positioned. To ensure accuracy, you should include a negative margin on one side equal to half the width of the element. This error becomes evident when assigning a left value of 100%, causing the marker to exceed the intended range.
It is evident that the situation varies due to the presence of an element with a random width, and the calculations for left and right are derived from either side. The difference between calculating 75% from the left edge as opposed to 25% from the right edge at a certain distance away from the left is significant.
The concept of the 25% and 75% represents the distance between the right edge of an element and the edge of a page on both sides. To visually understand this better, applying background colors to elements in a code sandbox can be helpful. Here is an example where I added background-color: blue to two elements for clarity:
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