I originally thought that the pre(html tag) would act just like 'white-space:pre'. However, it turns out that it does not behave in the same way.
<pre>
aaa
bbb
</pre>
<p style="white-space:pre;">
aaa
bbb
</p>
The <pre> element ignores the first and last \n, while the <p> element keeps the first \n and ignores the last one. Why is this?
According to the HTML standard:
Remember: Within the HTML syntax, any leading newline character right after the starting tag of a pre element will be removed.
For more information, visit this link:
Hence, the <pre> element follows this particular rule. It appears that if other elements have a white-space:pre setting, this rule is not in effect.
Essentially, both elements are equal in terms of content display. The discrepancy in spacing that you're observing with <p> tags is due to the default behavior of adding an empty line above itself for paragraph separation. Conversely, <pre> does not incorporate this feature, resulting in no additional space.
It's important to understand the distinction between the HTML pre element and the CSS property white-space: pre. These two are separate concepts, so don't confuse them. However, if you're talking about how line breaks are rendered, that's a different story.
According to the official specifications, a line break right after an opening tag should be disregarded. Therefore,
<pre>
aaa
bbb
</pre>
should be the same as
<pre>aaa
bbb
</pre>
This rule shouldn't change even if you swap p for pre or apply some styling. But web browsers sometimes don't follow the rules, which is the case here.
Browsers handle elements differently. The key takeaway is to minimize the use of the pre element and white-space: pre. If you do use them, be aware of this behavior. If necessary, avoid starting a tag immediately with a line break, and instead insert a space before the line break (if you want an empty line at the beginning).
The <pre> element shows content in a monospace font where each character has the same width.
This makes it more readable compared to the default browser font used in
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