What is causing the variations in line heights on this webpage?

I have recently created a test webpage, and I noticed that despite using the same CSS style, the line heights are different. This discrepancy is more prominent when viewing the page in Chrome and highlighting the usage of the .instruction class. It appears that the total margins between two lines are halved for elements directly adjacent to brackets.

You can access the CSS file here.

It's important to note that all lines are styled with the exact same .instruction class CSS properties:

.instruction {
    max-width: 48ch;
    display: flex;
    flex-direction: row;
    margin: 0.2em 0em;
    vertical-align: middle;
}

Any assistance or insights on this matter would be highly appreciated!

htmlcssmargin

Answer №1

There may be two possible reasons for this issue:

Cause 1

The em unit is relative to the font size of the parent element. Check out this helpful link for more information.

If your margin sizes are inconsistent, it could be due to differences in the font sizes of parent elements.

To ensure consistent margins, consider using absolute values like margin: 5px 0; or relative units like rem.

The rem unit is relative to the font size of the root element (default 16px).

.instruction {
    max-width: 48ch;
    display: flex;
    margin: 0.2rem 0;
    vertical-align: middle;
}

Cause 2

Margin Collapsing

Margin collapsing occurs when top and bottom margins of blocks are combined into a single margin with the largest size among them.

For more details on margin collapsing and how to prevent it, visit this page.

To avoid margin collapsing, you can use display:flex; or display:grid; as a quick workaround.

Margins do not collapse within containers that have their display set to flex or grid.

Additional Note:

flex-direction: row; is a default value, so there's no need to explicitly define it. For more details, refer to this handy link.

Answer №2

Consider using either pixels (px) or rems for setting margins.

.guidelines {
max-width: 48ch;
display: flex;
margin: 0.2rem 0;
vertical-align: middle;
}

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