Senin başlaman için bu makalede HTML'in mutlak temellerini ele alıyoruz . Unsurları, nitelikleri ve duymuş olabileceğiniz diğer tüm önemli terimleri ve bunların dile uygun olanlarını tanımlıyoruz. Ayrıca bir HTML öğesinin nasıl yapılandırıldığını, tipik bir HTML sayfasının nasıl yapılandırıldığını ve diğer önemli temel dil özelliklerini açıklıyoruz. Bu arada, sizin ilginizi çekmek için HTML ile biraz oynayacağız!
| Ön Koşullar: |
Temel bilgisayar bilgisi, temel yazılım kurulumu ve dosyalarla çalışma için temel bilgi |
|---|---|
| Hedef: | HTML dilini temel olarak tanımak ve birkaç HTML öğesi yazmak için biraz pratik yapmak. |
{{glossary("HTML")}} (Hypertext Markup Language) bir programlama dili değildir; Tarayıcınıza, ziyaret ettiğiniz web sayfalarının nasıl yapılandırılacağını anlatmak için kullanılan bir işaretleme dilidir. Web geliştiricisinin istediği kadar karmaşık veya basit olabilir. HTML, içeriğin farklı bölümlerini belli bir şekilde görünmesini veya göstermesini sağlamak için sarmak, sarmak veya işaretlemek için kullandığınız bir dizi {{sözlükçe ("Element", "elements")}} dizisinden oluşur. Ekteki {{glossary ("Tag", "tags")}}, web'deki başka bir sayfaya bağlantı kurmak, kelimeleri italikleştirmek vb. İçin köprü içeren bir içerik içerebilir. Örneğin, aşağıdaki içerik satırını kullanın:
My cat is very grumpy
Satırın tek başına durmasını istiyorsak, paragrafın içine paragraf ekleyerek paragraf ({{htmlelement("p")}}) olduğunu belirleyebiliriz
<p>My cat is very grumpy</p>
Not: HTML'deki etiketler büyük / küçük harf duyarsızdır, yani büyük veya küçük harf olarak yazılabilirler. Örneğin, bir {{htmlelement ("title")}} etiketi <title>, <TITLE>, <Title>, <TiTlE>, vb. ile yazılabilir ve düzgün çalışacaktır. Bununla birlikte, en iyi uygulama tutarlılık, okunabilirlik ve diğer nedenlerle tüm etiketleri küçük harflerle yazmaktır.
Paragraf elemanımızı biraz daha inceleyelim:
Öğemizin ana bölümleri:
Giriş alanını aşağıdaki satırı <em> ve </em> etiketleriyle sararak düzenleyin (öğeyi açmadan önce <em> ve öğeyi kapatmak için </em> koyun) - bu kodun satıra gerekir italik vurgu vermelidir! Değişikliklerinizin güncellemesini Çıktı alanında canlı olarak görebilirsiniz.
Bir hata yaparsanız, Sıfırla düğmesini kullanarak her zaman sıfırlayabilirsiniz. Gerçekten sıkışırsanız, cevabı görmek için Çözümü göster düğmesine basın.
<h2>Live output</h2> <div class="output" style="min-height: 50px;"> </div> <h2>Editable code</h2> <p class="a11y-label">Press Esc to move focus away from the code area (Tab inserts a tab character).</p> <textarea id="code" class="playable-code" style="min-height: 100px;width: 95%"> This is my text. </textarea> <div class="controls"> <input id="reset" type="button" value="Reset" /> <input id="solution" type="button" value="Show solution" /> </div>
html {
font-family: 'Open Sans Light',Helvetica,Arial,sans-serif;
}
h2 {
font-size: 16px;
}
.a11y-label {
margin: 0;
text-align: right;
font-size: 0.7rem;
width: 98%;
}
body {
margin: 10px;
background: #f5f9fa;
}
var textarea = document.getElementById('code');
var reset = document.getElementById('reset');
var solution = document.getElementById('solution');
var output = document.querySelector('.output');
var code = textarea.value;
var userEntry = textarea.value;
function updateCode() {
output.innerHTML = textarea.value;
}
reset.addEventListener('click', function() {
textarea.value = code;
userEntry = textarea.value;
solutionEntry = htmlSolution;
solution.value = 'Show solution';
updateCode();
});
solution.addEventListener('click', function() {
if(solution.value === 'Show solution') {
textarea.value = solutionEntry;
solution.value = 'Hide solution';
} else {
textarea.value = userEntry;
solution.value = 'Show solution';
}
updateCode();
});
var htmlSolution = '<em>This is my text.</em>';
var solutionEntry = htmlSolution;
textarea.addEventListener('input', updateCode);
window.addEventListener('load', updateCode);
// stop tab key tabbing out of textarea and
// make it write a tab at the caret position instead
textarea.onkeydown = function(e){
if (e.keyCode === 9) {
e.preventDefault();
insertAtCaret('\t');
}
if (e.keyCode === 27) {
textarea.blur();
}
};
function insertAtCaret(text) {
var scrollPos = textarea.scrollTop;
var caretPos = textarea.selectionStart;
var front = (textarea.value).substring(0, caretPos);
var back = (textarea.value).substring(textarea.selectionEnd, textarea.value.length);
textarea.value = front + text + back;
caretPos = caretPos + text.length;
textarea.selectionStart = caretPos;
textarea.selectionEnd = caretPos;
textarea.focus();
textarea.scrollTop = scrollPos;
}
// Update the saved userCode every time the user updates the text area code
textarea.onkeyup = function(){
// We only want to save the state when the user code is being shown,
// not the solution, so that solution is not saved over the user code
if(solution.value === 'Show solution') {
userEntry = textarea.value;
} else {
solutionEntry = textarea.value;
}
updateCode();
};
{{ EmbedLiveSample('Playable_code', 700, 400, "", "", "hide-codepen-jsfiddle") }}
Öğeleri başka öğelerin içine de yerleştirebilirsiniz - buna iç içe geçmiş öge denir. Kedimizin çok huysuz olduğunu söylemek istersek, "çok" kelimesini bir {{htmlelement ("strong")}} öğesinin içine koyabiliriz, bu kelimenin güçlü bir şekilde vurgulanması gerektiği anlamına gelir:
<p>My cat is <strong>very</strong> grumpy.</p>
Bununla birlikte, elemanlarınızın uygun şekilde olduklarından emin olmanız gerekir: yukarıdaki örnekte önce p elementini, sonra güçlü elementi açtık, bu nedenle önce güçlü elementi, sonra p'yi kapatmalıyız. Aşağıdaki yanlış:
<p>My cat is <strong>very grumpy.</p></strong>
Elemanlar doğru açılıp kapanmalıdır, bu yüzden açıkça birbirlerinin içinde veya dışındadırlar. Yukarıdaki gibi çakışırlarsa, web tarayıcınız ne söylemeye çalıştığınızı en iyi şekilde tahmin etmeye çalışır ve beklenmedik sonuçlar elde edebilirsiniz. Öyleyse yapmayın!
HTML'de bilmeniz gereken iki önemli öğe kategorisi vardır. Blok düzeyinde elemanlar ve satır içi elemanlar.
Aşağıdaki örneği ele alalım:
<em>first</em><em>second</em><em>third</em> <p>fourth</p><p>fifth</p><p>sixth</p>
{{htmlelement ("em")}} bir satır içi öğedir, aşağıda görebileceğiniz gibi, ilk üç öğe, aralarında boşluk olmayan, aynı satırda oturur. Öte yandan, {{htmlelement ("p")}} blok düzeyinde bir öğedir, bu nedenle her öğe yeni bir satırda, her birinin üstünde ve altında boşluk olacak şekilde görünür (boşluk, tarayıcının paragraflara uyguladığı varsayılan CSS stilinden kaynaklanır ).
{{ EmbedLiveSample('Block_versus_inline_elements', 700, 200, "", "") }}
Not: HTML5, HTML5'deki öğe kategorilerini yeniden tanımladı: bkz. Öğe içeriği kategorileri. Bu tanımlar, daha öncekilerden daha doğru ve daha az belirsiz olsa da, "blok" ve "satır içi" den daha anlaşılması çok daha karmaşık olsa da, bu konu boyunca bunlara sadık kalacağız.
Not: Bu başlıkta kullanıldığı şekliyle "blok" ve "satır içi" terimleri aynı ada sahip CSS kutularının tipleriyle karıştırılmamalıdır. Varsayılan olarak ilişkilendirilirken, CSS görüntüleme türünü değiştirmek öğenin kategorisini değiştirmez ve hangi öğeleri içerebileceğini ve hangi öğeleri içerebileceğini etkilemez. HTML5'in bu terimleri bırakmasının nedenlerinden biri Bu oldukça yaygın karışıklığı önlemek.
Note: Blok ve satır içi öğelerin listelerini içeren faydalı referans sayfalarını bulabilirsiniz - bkz. Blok düzeyinde öğeler ve Satır içi öğeler.
Tüm elemanlar yukarıdaki açılış etiketi, içerik ve kapanış etiketini takip etmez. Bazı öğeler yalnızca belgeye bir şey eklemek / yerleştirmek için genellikle kullanılan tek bir etiketten oluşur. Örneğin, {{htmlelement ("img")}} öğesi, bir görüntü dosyasını içinde bulunduğu konumda bir sayfaya yerleştirir:
<img src="https://raw.githubusercontent.com/mdn/beginner-html-site/gh-pages/images/firefox-icon.png">
Bu, sayfanıza aşağıdakilerin çıktısını verir:
{{ EmbedLiveSample('Empty_elements', 700, 300, "", "", "hide-codepen-jsfiddle") }}
Not: Boş elemanlara bazen boş elemanlar da denir.
Öğelerin ayrıca şuna benzeyen nitelikleri de olabilir:
Öznitelikler, gerçek içerikte görünmesini istemediğiniz öğe hakkında ek bilgi içerir. Bu durumda, class niteliği, öğeye daha sonra stil bilgisi ve diğer şeylerle öğeyi hedeflemek için kullanılabilecek bir tanımlayıcı ad vermenizi sağlar.
Bir nitelik şunlara sahip olmalıdır:
Another example of an element is {{htmlelement("a")}} — this stands for "anchor" and will make the piece of text it wraps around into a hyperlink. This can take a number of attributes, but several are as follows:
href: This attribute specifies as its value the web address that you want the link to point to; where the browser navigates to when the link is clicked. For example, href="https://www.mozilla.org/".title: The title attribute specifies extra information about the link, such as what the page is that you are linking to. For example, title="The Mozilla homepage". This will appear as a tooltip when hovered over.target: The target attribute specifies the browsing context which will be used to display the link. For example, target="_blank" will display the link in a new tab. If you want to display the link in the current tab just omit this attribute.Edit the line below in the Input area to turn it into a link to your favorite website. First, add the <a> element. Second, add the href attribute and the title attribute. Lastly, specify the target attribute to open the link in the new tab. You'll be able to see your changes update live in the Output area. You should see a link that when hovered over displays the title attribute's content, and when clicked navigates to the web address in the href element. Remember that you need to include a space between the element name, and each attribute.
If you make a mistake, you can always reset it using the Reset button. If you get really stuck, press the Show solution button to see the answer.
<h2>Live output</h2> <div class="output" style="min-height: 50px;"> </div> <h2>Editable code</h2> <p class="a11y-label">Press Esc to move focus away from the code area (Tab inserts a tab character).</p> <textarea id="code" class="input" style="min-height: 100px;width: 95%"> <p>A link to my favorite website.</p> </textarea> <div class="playable-buttons"> <input id="reset" type="button" value="Reset"> <input id="solution" type="button" value="Show solution"> </div>
html {
font-family: sans-serif;
}
h2 {
font-size: 16px;
}
.a11y-label {
margin: 0;
text-align: right;
font-size: 0.7rem;
width: 98%;
}
body {
margin: 10px;
background: #f5f9fa;
}
var textarea = document.getElementById('code');
var reset = document.getElementById('reset');
var solution = document.getElementById('solution');
var output = document.querySelector('.output');
var code = textarea.value;
var userEntry = textarea.value;
function updateCode() {
output.innerHTML = textarea.value;
}
reset.addEventListener('click', function() {
textarea.value = code;
userEntry = textarea.value;
solutionEntry = htmlSolution;
solution.value = 'Show solution';
updateCode();
});
solution.addEventListener('click', function() {
if(solution.value === 'Show solution') {
textarea.value = solutionEntry;
solution.value = 'Hide solution';
} else {
textarea.value = userEntry;
solution.value = 'Show solution';
}
updateCode();
});
var htmlSolution = '<p>A link to my <a href="https://www.mozilla.org/" title="The Mozilla homepage" target="_blank">favorite website</a>.</p>';
var solutionEntry = htmlSolution;
textarea.addEventListener('input', updateCode);
window.addEventListener('load', updateCode);
// stop tab key tabbing out of textarea and
// make it write a tab at the caret position instead
textarea.onkeydown = function(e){
if (e.keyCode === 9) {
e.preventDefault();
insertAtCaret('\t');
}
if (e.keyCode === 27) {
textarea.blur();
}
};
function insertAtCaret(text) {
var scrollPos = textarea.scrollTop;
var caretPos = textarea.selectionStart;
var front = (textarea.value).substring(0, caretPos);
var back = (textarea.value).substring(textarea.selectionEnd, textarea.value.length);
textarea.value = front + text + back;
caretPos = caretPos + text.length;
textarea.selectionStart = caretPos;
textarea.selectionEnd = caretPos;
textarea.focus();
textarea.scrollTop = scrollPos;
}
// Update the saved userCode every time the user updates the text area code
textarea.onkeyup = function(){
// We only want to save the state when the user code is being shown,
// not the solution, so that solution is not saved over the user code
if(solution.value === 'Show solution') {
userEntry = textarea.value;
} else {
solutionEntry = textarea.value;
}
updateCode();
};
{{ EmbedLiveSample('Playable_code2', 700, 400, "", "", "hide-codepen-jsfiddle") }}
You'll sometimes see attributes written without values — this is perfectly allowed. These are called boolean attributes, and they can only have one value, which is generally the same as the attribute name. As an example, take the {{htmlattrxref("disabled", "input")}} attribute, which you can assign to form input elements if you want them to be disabled (greyed out) so the user can't enter any data in them.
<input type="text" disabled="disabled">
As shorthand, it is perfectly allowable to write this as follows (we've also included a non-disabled form input element for reference, to give you more of an idea what is going on):
<!-- using the disabled attribute prevents the end user from entering text into the input box --> <input type="text" disabled> <!-- The user can enter text into the follow input, as it doesn't contain the disabled attribute --> <input type="text">
The above HTML will give you a rendered output as follows:
{{ EmbedLiveSample('Boolean_attributes', 700, 100, "", "", "hide-codepen-jsfiddle") }}
When you look around the World Wide Web, you'll come across a number of strange markup styles, including attribute values without quotes. This is allowable in certain circumstances, but will break your markup in others. For example, if we revisit our link example from earlier, we could write a basic version with only the href attribute, like this:
<a href=https://www.mozilla.org/>favorite website</a>
However, as soon as we add the title attribute in this style, things will go wrong:
<a href=https://www.mozilla.org/ title=The Mozilla homepage>favorite website</a>
At this point the browser will misinterpret your markup, thinking that the title attribute is actually three attributes — a title attribute with the value "The", and two boolean attributes, Mozilla and homepage. This is obviously not what was intended, and will cause errors or unexpected behavior in the code, as seen in the live example below. Try hovering over the link to see what the title text is!
{{ EmbedLiveSample('Omitting_quotes_around_attribute_values', 700, 100, "", "", "hide-codepen-jsfiddle") }}
Our advice is to always include the attribute quotes — it avoids such problems, and results in more readable code too.
In this article you'll notice that the attributes are all wrapped in double quotes. You might however see single quotes in some people's HTML. This is purely a matter of style, and you can feel free to choose which one you prefer. Both the following lines are equivalent:
<a href="http://www.example.com">A link to my example.</a> <a href='http://www.example.com'>A link to my example.</a>
You should however make sure you don't mix them together. The following will go wrong!
<a href="http://www.example.com'>A link to my example.</a>
If you've used one type of quote in your HTML, you can include the other type of quote inside your attribute values without causing any problems:
<a href="http://www.example.com" title="Isn't this fun?">A link to my example.</a>
However if you want to include a quote within the quotes where both the quotes are of the same type (single quote or double quote), you'll have to use HTML entities for the quotes. For example, this will break:
<a href='http://www.example.com' title='Isn't this fun?'>A link to my example.</a>
So you need to do this:
<a href='http://www.example.com' title='Isn't this fun?'>A link to my example.</a>
That wraps up the basics of individual HTML elements, but they aren't very useful on their own. Now we'll look at how individual elements are combined to form an entire HTML page:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>My test page</title>
</head>
<body>
<p>This is my page</p>
</body>
</html>
Here we have:
<!DOCTYPE html>: The doctype. In the mists of time, when HTML was young (about 1991/2), doctypes were meant to act as links to a set of rules that the HTML page had to follow to be considered good HTML, which could mean automatic error checking and other useful things. They used to look something like this:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">However, these days no one really cares about them, and they are really just a historical artifact that needs to be included for everything to work right.
<!DOCTYPE html> is the shortest string of characters that counts as a valid doctype; that's all you really need to know.<html></html>: The {{htmlelement("html")}} element. This element wraps all the content on the entire page, and is sometimes known as the root element.<head></head>: The {{htmlelement("head")}} element. This element acts as a container for all the stuff you want to include on the HTML page that isn't the content you are showing to your page's viewers. This includes things like keywords and a page description that you want to appear in search results, CSS to style our content, character set declarations, and more. You'll learn more about this in the next article in the series.<meta charset="utf-8">: This element sets the character set your document should use to UTF-8, which includes most characters from the vast majority of human written languages. Essentially it can now handle any textual content you might put on it. There is no reason not to set this, and it can help avoid some problems later.<title></title>: The {{htmlelement("title")}} element. This sets the title of your page, which is the title that appears in the browser tab the page is loaded in, and is used to describe the page when you bookmark/favorite it.<body></body>: The {{htmlelement("body")}} element. This contains all the content that you want to show to web users when they visit your page, whether that's text, images, videos, games, playable audio tracks, or whatever else.If you want to experiment with writing some HTML on your local computer, you can:
index.html.Note: You can also find this basic HTML template on the MDN Learning Area Github repo.
You can now open this file in a web browser to see what the rendered code looks like, and then edit the code and refresh the browser to see what the result is. Initially it will look like this:
So in this exercise, you can edit the code locally on your computer, as outlined above, or you can edit it in the editable sample window below (the editable sample window represents just the contents of the {{htmlelement("body")}} element, in this case). We'd like you to have a go at implementing the following steps:
<h1> opening tag and </h1> closing tag.<strong> opening tag and </strong> closing tag.If you make a mistake, you can always reset it using the Reset button. If you get really stuck, press the Show solution button to see the answer.
<h2>Live output</h2> <div class="output" style="min-height: 50px;"> </div> <h2>Editable code</h2> <p class="a11y-label">Press Esc to move focus away from the code area (Tab inserts a tab character).</p> <textarea id="code" class="input" style="min-height: 100px;width: 95%"> <p>This is my page</p> </textarea> <div class="playable-buttons"> <input id="reset" type="button" value="Reset"> <input id="solution" type="button" value="Show solution"> </div>
html {
font-family: sans-serif;
}
h1 {
color: blue;
}
h2 {
font-size: 16px;
}
.a11y-label {
margin: 0;
text-align: right;
font-size: 0.7rem;
width: 98%;
}
img {
max-width: 100%;
}
body {
margin: 10px;
background: #f5f9fa;
}
var textarea = document.getElementById('code');
var reset = document.getElementById('reset');
var solution = document.getElementById('solution');
var output = document.querySelector('.output');
var code = textarea.value;
var userEntry = textarea.value;
function updateCode() {
output.innerHTML = textarea.value;
}
reset.addEventListener('click', function() {
textarea.value = code;
userEntry = textarea.value;
solutionEntry = htmlSolution;
solution.value = 'Show solution';
updateCode();
});
solution.addEventListener('click', function() {
if(solution.value === 'Show solution') {
textarea.value = solutionEntry;
solution.value = 'Hide solution';
} else {
textarea.value = userEntry;
solution.value = 'Show solution';
}
updateCode();
});
var htmlSolution = '<h1>Some music</h1><p>I really enjoy <strong>playing the drums</strong>. One of my favorite drummers is Neal Peart, who\ plays in the band <a href="https://en.wikipedia.org/wiki/Rush_%28band%29" title="Rush Wikipedia article">Rush</a>.\ My favourite Rush album is currently <a href="http://www.deezer.com/album/942295">Moving Pictures</a>.</p>\ <img src="http://www.cygnus-x1.net/links/rush/images/albums/sectors/sector2-movingpictures-cover-s.jpg">';
var solutionEntry = htmlSolution;
textarea.addEventListener('input', updateCode);
window.addEventListener('load', updateCode);
// stop tab key tabbing out of textarea and
// make it write a tab at the caret position instead
textarea.onkeydown = function(e){
if (e.keyCode === 9) {
e.preventDefault();
insertAtCaret('\t');
}
if (e.keyCode === 27) {
textarea.blur();
}
};
function insertAtCaret(text) {
var scrollPos = textarea.scrollTop;
var caretPos = textarea.selectionStart;
var front = (textarea.value).substring(0, caretPos);
var back = (textarea.value).substring(textarea.selectionEnd, textarea.value.length);
textarea.value = front + text + back;
caretPos = caretPos + text.length;
textarea.selectionStart = caretPos;
textarea.selectionEnd = caretPos;
textarea.focus();
textarea.scrollTop = scrollPos;
}
// Update the saved userCode every time the user updates the text area code
textarea.onkeyup = function(){
// We only want to save the state when the user code is being shown,
// not the solution, so that solution is not saved over the user code
if(solution.value === 'Show solution') {
userEntry = textarea.value;
} else {
solutionEntry = textarea.value;
}
updateCode();
};
{{ EmbedLiveSample('Playable_code3', 700, 600, "", "", "hide-codepen-jsfiddle") }}
In the above examples you may have noticed that a lot of whitespace is included in the code listings — this is not necessary at all; the two following code snippets are equivalent:
<p>Dogs are silly.</p>
<p>Dogs are
silly.</p>
No matter how much whitespace you use (which can include space characters, but also line breaks), the HTML parser reduces each one down to a single space when rendering the code. So why use so much whitespace? The answer is readability — it is so much easier to understand what is going on in your code if you have it nicely formatted, and not just bunched up together in a big mess. In our HTML we've got each nested element indented by two spaces more than the one it is sitting inside. It is up to you what style of formatting you use (how many spaces for each level of indentation, for example), but you should consider formatting it.
In HTML, the characters <, >,",' and & are special characters. They are parts of the HTML syntax itself, so how do you include one of these characters in your text, for example if you really want to use an ampersand or less-than sign, and not have it interpreted as code as some browsers may do?
We have to use character references — special codes that represent characters, and can be used in these exact circumstances. Each character reference is started with an ampersand (&), and ended by a semicolon (;).
| Literal character | Character reference equivalent |
|---|---|
| < | < |
| > | > |
| " | " |
| ' | ' |
| & | & |
The character reference equivalent could be easily remembered because the words it uses can be seen as less than for '<' , quotation for ' " ' and similarly for each. Do checkout the link to the wikipedia page to find more about entity reference. In the below example, you can see two paragraphs, which are talking about web technologies:
<p>In HTML, you define a paragraph using the <p> element.</p> <p>In HTML, you define a paragraph using the <p> element.</p>
In the live output below, you can see that the first paragraph has gone wrong, because the browser thinks that the second instance of <p> is starting a new paragraph. The second paragraph looks fine, because we have replaced the angle brackets with character references.
{{ EmbedLiveSample('Entity_references_Including_special_characters_in_HTML', 700, 200, "", "", "hide-codepen-jsfiddle") }}
Note: A chart of all the available HTML character entity references can be found on Wikipedia: List of XML and HTML character entity references. Note that you don't need to use entity references for any other symbols, as modern browsers will handle the actual symbols just fine as long as your HTML's character encoding is set to UTF-8.
In HTML, as with most programming languages, there is a mechanism available to write comments in the code — comments are ignored by the browser and invisible to the user, and their purpose is to allow you to include comments in the code to say how your code works, what the different parts of the code do, etc. This can be very useful if you return to a code base that you've not worked on for six months, and can't remember what you did — or if you hand your code over to someone else to work on.
To turn a section of content inside your HTML file into a comment, you need to wrap it in the special markers <!-- and -->, for example:
<p>I'm not inside a comment</p> <!-- <p>I am!</p> -->
As you can see below, the first paragraph appears in the live output, but the second one doesn't.
{{ EmbedLiveSample('HTML_comments', 700, 100, "", "", "hide-codepen-jsfiddle") }}
You've reached the end of the article — we hope you enjoyed your tour of the very basics of HTML! At this point you should understand what the language looks like, how it works at a basic level, and be able to write a few elements and attributes. This is a perfect place to be right now, as in subsequent articles in the module we will go into some of the things you have already looked at in a lot more detail, and introduce some new features of the language. Stay tuned!
Note: At this point, as you start to learn more about HTML, you might also want to start to explore the basics of Cascading Style Sheets, or CSS. CSS is the language you use to style your web pages (e.g., changing the font or colors, or altering the page layout). HTML and CSS go very well together, as you'll soon discover.