Troubleshooting Problems with CSS Margins

I am facing an issue with my CSS code where using margin: 0 instead of margin-top: 0 for header p seems to make the header { margin: 0 0 20px; } rule ineffective. Is this how it is supposed to work? Upon inspecting in Firebug, it appears that the margin-bottom property of header collapses into the next sibling element, which is the section.

Here's the HTML snippet:

<header>
    <h1>ToDo List</h1>
    <p>HTML5 Offline Capable Web Application</p>
</header>

CSS Code:

header { font: 24px/1em Notethis; color: #666; margin: 0 0 20px; }
header h1 { font: 60px/1.4em Hetilica; margin: 0; }
header p { margin-top: 0; }
css

Answer №1

Firebug usually only reveals part of the story to you.

If you want to truly understand what happens when you switch from margin-top: 0; to margin: 0 0 0 0;, click on the arrow beside the Style tab (located above 'header p' in your snapshot) and select "Display default CSS properties" or something similar. You will then notice that html.css already styles p as:

p {
    display: block;
    margin: 1em 0;
}

Be careful not to alter system styles, as this may require restarting Firefox. Simply reopening tabs will not suffice.

By the way, the 1em margin is evident in HTML without any style applied (select Display / Page style / No style in Firefox or check the CSS menu of the Web Developer Toolbar): your paragraphs naturally have some vertical margin.

In essence, you eliminated a 1em bottom margin.

Answer №2

It appears that the issue at hand is related to the header element not displaying any applied margin. The space you notice is actually a default margin being applied to header p.

The problem stems from some browsers not automatically recognizing the header tag as a block-level element unless specifically defined as such:

header { display: block; }

By adding this rule to your CSS for header, you can then set header p { margin: 0 } without losing the specified margin in header itself. If you remove this rule, the behavior will revert to what you are currently experiencing.

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