HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.
In CodePen, whatever you write in the HTML editor is what goes within the <body>
tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html>
tag. If you want to add classes there that can affect the whole document, this is the place to do it.
In CodePen, whatever you write in the HTML editor is what goes within the <body>
tags in a basic HTML5 template. If you need things in the <head>
of the document, put that code here.
The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.
CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.
It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.
To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit-
or -moz-
.
We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).
Any URLs added here will be added as <link>
s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.
You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.
You can also link to another Pen here (use the .css
URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.
JavaScript preprocessors can help make authoring JavaScript easier and more convenient.
Babel includes JSX processing.
Any URL's added here will be added as <script>
s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.
You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.
If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.
You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.
Search for and use JavaScript packages from npm here. By selecting a package, an import
statement will be added to the top of the JavaScript editor for this package.
Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.
All packages are different, so refer to their docs for how they work.
If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.
If active, Pens will autosave every 30 seconds after being saved once.
If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.
If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.
Visit your global Editor Settings.
///////////////////////Exercises /////////////////////////
// 1. Declare a new variable named hours, and set it equal to 12. Use a conditional operator to print "open" if the variable 'hours' is less than or equal to 18, and 'closed' otherwise. Use document.write to write the value of the variable to the webpage.
/*
2. What is the result of the value of z in these examples?
x = 50;
y = 27;
j = 64;
z = x > 90 && y < 9;
value?
z = x <= j && y >= 9;
value?
z = x != j++ && y == 5 * 6;
value?
3. What is the result of the value of z in these examples?
x = 20;
y = 30;
z = x / 2 <= 10 || y / 2 >= 15;
value?
z = x * 5 != 100 || x * 5 == 50;
value?
z = x * 5 <= 100 || x * 5 >= 50;
value?
4. What is the result of the value of z in these examples?
x = false;
y = true;
z = !x || !y;
value?
z = !z;
value?
z = !z && !x;
value?
*/
////////Extra Exercises:
//1. Write the symbol for the or operator as a comment.
//2. Write the symbol for the and operator as a comment.
//3. Create a variable that stores the time that you usually wake up (remember to put this as just a number!)
//4. Create a second variable that stores the time you woke up today.
//5. Using the conditional operator that we learned on Monday, test whether the second variable is more than or equal to the first variable. If it is, have your code evaluate to "too late" If it is not, have your code evaluate to "on time"
//6. Log your whole conditional operator into the console to check whether you woke up on time or too late!
/* Remember, the conditional operator follows this syntax:
condition ? value1 : value2. So your condition will be whether the second variable is less than or equal to the first, and your value1 and value2 will be you "too late" and "on time"
*/
//7. Create an array that stores five different numbers.
//8. Create a new variable in which you write a line of code that tests whether the first number in the array is greater or equal to the second number, AND the fifth number is less than or equal to the third number. (Remember, when calling up data in the array, you just put the name of the variable and the index number in square brackets).
//9. Log the new variable into the console.
//10. Create a new variable in which you test whether the first number is not equal to the second number, OR whether the second number is equal in data type and value to the fourth number.
//11. Log the new variable into the console.
Also see: Tab Triggers