code vs pre vs samp for inline and block code snippets
Something I completely missed: the non-wrapping behaviour of <pre>
can be controlled with CSS. So this gives the exact result I was looking for:
code { background: hsl(220, 80%, 90%); }
pre { white-space: pre-wrap; background: hsl(30,80%,90%);}
Here's an example demonstrating the <code><code></code> tag.
<pre>Here's a very long pre-formatted formatted using the <pre> tag. Notice how it wraps? It goes on and on and on and on and on and on and on and on and on and on...</pre>
What is difference between pre and code HTML Tag?
Don't go to w3schools. Check the w3c documentation for pre and code instead.
PRE:
The PRE element tells visual user agents that the enclosed text is
"preformatted". When handling preformatted text, visual user agents:
- May leave white space intact.
- May render text with a fixed-pitch font.
- May disable automatic word wrap.
- Must not disable bidirectional processing.
CODE:
Designates a fragment of computer code.
Why does HTML5 recommend putting the code element inside pre?
<code>
represents only a "fragment of computer code". It was originally thought for simple code snippets like i++
or <code>
.
<pre>
"represents a block of preformatted text, in which structure is represented by typographic conventions rather than by elements". It's original purpose was nothing more than exactly this: provide a text in the same way it was given by the author, e.g.
+----------------------------------+
| |
| WARNING! PREFORMATED TEXT AHEAD! | =o=
| __; ~^
+----------------TT------------°
|| _____________ _____________________
|| | TO GRANDMA > | TOTALLY NOT A TRAP >
oÖo || |°°°°°°°°°°°° °°°°°°°°°°°°°°°°°°°°°
| ö || | | .mm,
~"""~"""~"""~"""~"""~"""~~"""~"""~"""~"""~"""~"""~"""~"""~"""~""..MWMWc...~"""~""
You don't need to use each with each other. <pre>
has its own roles, like <code>
has its own. However, <pre>
is a way to signalize that the white-space in the given fragment is important, a role that <code>
is missing.
However, back to your question: note the exact wording:
The following example shows how a block of code could be marked up using the
pre
andcode
elements.<pre><code class="language-pascal">var i: Integer;
begin
i := 1;
end.</code></pre>
A class is used in that example to indicate the language used.
It says could, not should. You're free to do this how you want. It's not recommended by the W3C in any way, however, I personally recommend you to use <pre><code>...
.
Further explanation
Whenever white-space is part of your code and the structure of your code, you should state that this structure should be kept. As the structure in code is given by typographic conventions (tabs, linefeeds, spaces) I personally recommend you to use <pre><code>
, even if it's arguably more code and another node in the DOM. But whenever missing white-space will render your code imperfect it's necessary.
Apart from that you can easily differ between inline code and code-blocks without checking element.className
, and some JS syntax highlighter work pretty well with <pre><code>...
and strip the <code>
automatically.
Also, if you use a general rule for <code>
with white-space:pre;
, you cannot use it for inline snippets without additional classes. If you were to create a class instead, you've won nothing compared to <pre><code>
.
References
W3C: HTML5: 4.5.12 The code element (W3C Recommendation 28 October 2014)
The
code
element represents a fragment of computer code. This could be an XML element name, a file name, a computer program, or any other string that a computer would recognize.W3C: HTML5: 4.4.3 The pre element (W3C Recommendation 28 October 2014)
The
pre
element represents a block of preformatted text, in which structure is represented by typographic conventions rather than by elements.
Inline pre formatting?
<tt>text</tt> gives text
Wait... Wordpress? What HTML tags does it support?
Drop javascript in html and auto-format all code and/or pre blocks
This is a somewhat hacky solution, but looking at the (minified) code in that library, prettyprint
is used in the following section:
u = /\bprettyprint\b/
and
if ((k !== h || u.test(n)) && !e.test(n)) {
q = !1;
for (l = d.parentNode; l; l = l.parentNode)
if (w.test(l.tagName) && l.className &&
u.test(l.className)) {
It tests whether the className
of the iterated elements matches that regular expression. So, if you just remove those tests against u
, it should work without having to add a class to the <pre>
s:
if (!e.test(n)) {
q = !1;
for (l = d.parentNode; l; l = l.parentNode)
if (w.test(l.tagName)) {
It's now only testing if w
(/^(?:pre|code|xmp)$/i
) matches the tagName
of the element.
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<pre>class Voila {public: // Voila static const string VOILA = "Voila";
// will not interfere with embedded <a href="#voila2">tags</a>.}</pre>
issue with hiding a Code block for a quiz
You have multiple error in this code:
id
must be unique useclass
instead.- use
<div>
for contain<pre>
instead of<p>
function show_hide(element) {
const myAnswer = element.nextElementSibling;
const displaySetting = myAnswer.style.display;
if (displaySetting === "inline-block") {
myAnswer.style.display = 'none';
element.innerHTML = 'Show Solution';
} else {
myAnswer.style.display = 'inline-block';
element.innerHTML = 'Hide Solution';
}
}
.quiz-question {
margin-bottom: 10px;
text-align: left;
font-size: 15px;
color: #f44336;
font-weight: 400;
}
.quiz-button {
display: inline-block;
text-decoration: none;
color: #111;
border: 1px solid #f44336;
padding: 5px 5px;
font-size: 13px;
background: transparent;
position: relative;
cursor: pointer;
}
.quiz-button:hover {
color: #fff;
background: #f44336;
transition: 0.5s;
}
.answer {
display: none;
}
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.26.0/themes/prism.min.css" integrity="sha512-tN7Ec6zAFaVSG3TpNAKtk4DOHNpSwKHxxrsiw4GHKESGPs5njn/0sMCUMl2svV4wo4BK/rCP7juYz+zx+l6oeQ==" crossorigin="anonymous" referrerpolicy="no-referrer" />
<script src="https://cdn.jsdelivr.net/gh/CDNSFree2/PrismJS@latest/prism.min.js"></script>
<!-- Working Code -->
<h4 class="quiz-question">1. What is the difference between a statement and an expression?</h4>
<button onclick="show_hide(this)" class="quiz-button">Show Solution</button>
<p class="answer">
<b>Statements</b> are used when we want the program to perform an action. Expressions are used when we want the program to calculate a value.
</p>
<br><br>
<hr>
<h4>C - Question</h4>
<button onclick="show_hide(this)" class="quiz-button">Show Solution</button>
<div class='answer'>
<pre>
<code class="language-cpp line-numbers">
2 //2 is a literal that evaluates to value 2
"Hello World!" //"Hello World!" is a literal that evaluates to text "Hello"
</code>
</pre>
</div>
Emmet multiple inline elements with break lines
I found a solution for my question,
"emmet.syntaxProfiles": {
"html": {
"inline_break": true,
}
}
this should be added to the settings.json file
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