An internet internet code editor is most helpful once you wouldn’t have the chance to make use of a code editor utility, or once you need to shortly check out one thing on the internet along with your laptop and even your cell phone. That is additionally an attention-grabbing undertaking to work on as a result of having the information of easy methods to construct a code editor will provide you with concepts on easy methods to method different tasks that require you to combine a code editor to indicate some performance.
Listed below are just a few React ideas you’ll must know with a purpose to comply with alongside on this article:
Hooks,
Element construction,
Purposeful elements,
Props.
Utilizing CodeMirror
We will likely be utilizing a library named CodeMirror to construct our editor. CodeMirror is a flexible textual content editor carried out in JavaScript for the browser. It’s particularly for modifying code and comes with numerous language modes and add-ons for extra superior modifying performance.
A wealthy programming API and a CSS theming system can be found for customizing CodeMirror to suit your utility and increasing it with new performance. It offers us the performance to create a wealthy code editor that runs on the internet and exhibits us the results of our code in actual time.
Within the subsequent part, we are going to arrange our new React undertaking and set up the libraries we have to construct our internet app.
Creating A New React Mission
Let’s begin by creating a brand new React undertaking. In your commandline interface, navigate to the listing during which you need to create your undertaking, and let’s create a React utility and identify it code_editor:
npx create-react-app code_editor
Having created our new React utility, let’s navigate to that undertaking’s listing within the commandline interface:
cd code_editor
There are two libraries we have to set up right here: codemirror and react-codemirror2.
npm set up codemirror react-codemirror2
Having put in the libraries we’d like for this undertaking, let’s create our tabs and allow tab switching between the three tabs that can seem in our editor (for HTML, CSS, and JavaScript).
Button Element
As a substitute of making particular person buttons, let’s make the button a element that’s reusable. In our undertaking, the button would have three cases, in keeping with the three tabs we’d like.
Create a folder named elements within the src folder. On this new elements folder, create a JSX file named Button.jsx.
Right here is all the code wanted within the Button element:
import React from ‘react’
const Button = ({title, onClick}) => {
return (
<div>
<button
model={{
maxWidth: “140px”,
minWidth: “80px”,
peak: “30px”,
marginRight: “5px”
}}
onClick={onClick}
>
{title}
</button>
</div>
)
}
export default Button
Here’s a full clarification of what we did above:
We created a practical element named Button, which we then exported.
We destructured title and onClick from the props coming into the element. Right here, title could be a string of textual content, and onClick could be a operate that will get referred to as when a button is clicked.
Subsequent, we used the button component to declare our button, and used the model attributes to model our button to look presentable.
We added the onClick attribute and handed our destructured onClick operate props to it.
The very last thing you’ll discover we did on this element is go in {title} because the content material of the button tag. This permits us to show the title dynamically, based mostly on what prop is being handed to the occasion of the button element when it’s referred to as.
Now that now we have created a reusable button element, let’s transfer on and produce our element into App.js. Go to App.js and import the newly created button element:
import Button from ‘./elements/Button’;
To trace which tab or editor is open, we’d like a declare state to carry the worth of the editor that’s open. Utilizing the useState React hook, we’ll arrange the state that can retailer the identify of the editor tab that’s at present open when that tab’s button is clicked.
Right here is how we do this:
import React, { useState } from ‘react’;
import ‘./App.css’;
import Button from ‘./elements/Button’;
operate App() {
const [openedEditor, setOpenedEditor] = useState(‘html’);
return (
<div className=”App”>
</div>
);
}
export default App;
Right here, we declared our state. It takes the identify of the editor that’s at present open. As a result of the worth html is handed because the state’s default worth, the HTML editor could be the tab open by default.
Let’s transfer on and write the operate that can use setOpenedEditor to vary the worth of the state when a tab button is clicked.
Notice: Two tabs will not be open on the identical time, so we’ll have to think about that when writing our operate.
Here’s what our operate, named onTabClick, seems to be like:
import React, { useState } from ‘react’;
import ‘./App.css’;
import Button from ‘./elements/Button’;
operate App() {
…
const onTabClick = (editorName) => {
setOpenedEditor(editorName);
};
return (
<div className=”App”>
</div>
);
}
export default App;
Right here, we handed a single operate argument, which is the identify of the tab at present chosen. This argument could be provided wherever the operate is known as, and the related identify of that tab could be handed in.
Let’s create three cases of our Button for the three tabs we’d like:
<div className=”App”>
<p>Welcome to the editor!</p>
<div className=”tab-button-container”>
<Button title=”HTML” onClick={() => {
onTabClick(‘html’)
}} />
<Button title=”CSS” onClick={() => {
onTabClick(‘css’)
}} />
<Button title=”JavaScript” onClick={() => {
onTabClick(‘js’)
}} />
</div>
</div>
Here’s what we did:
We began by including a p tag, mainly simply to offer some context to what our utility is about.
We used a div tag to wrap our tab buttons. The div tag carries a className that we’ll use to model the buttons right into a grid show within the CSS file later on this tutorial.
Subsequent, we declared three cases of the Button element. In case you recall, the Button element takes two props, title and onClick. In each occasion of the Button element, these two props are offered.
The title prop takes the title of the tab.
The onClick prop takes a operate, onTabClick, which we simply created and which takes a single argument: the identify of the tab chosen.
Based mostly on the tab at present chosen, we might use the JavaScript ternary operator to show the tab conditionally. Which means if the worth of the openedEditor state is about to html (i.e. setOpenedEditor(‘html’)), then the tab for the HTML part would turn into the at present seen tab. You’ll perceive this higher as we do it under:
…
return (
<div className=”App”>
…
<div className=”editor-container”>
{
openedEditor === ‘html’ ? (
<p>The html editor is open</p>
) : openedEditor === ‘css’ ? (
<p>The CSS editor is open!!!!!!</p>
) : (
<p>the JavaScript editor is open</p>
)
}
</div>
</div>
);
…
Let’s go over the code above in plain English. If the worth of openedEditor is html, then show the HTML part. In any other case, if the worth of openedEditor is css, then show the CSS part. In any other case, if the worth is neither html nor css, then which means the worth have to be js, as a result of now we have solely three doable values for the openedEditor state; so, then we’d show the tab for JavaScript.
We used paragraph tags (p) for the totally different sections within the ternary operator situations. As we proceed, we are going to create the editor elements and substitute the p tags with the editor elements themselves.
Now we have come thus far already! When a button is clicked, it fires up the motion that units the tab it represents to true, making that tab seen. Right here’s what our app at present seems to be like:
A GIF exhibiting the tab toggle we at present have. (Giant preview)
Let’s add just a little CSS to the div container holding the buttons. We wish the buttons to be displayed in a grid, as an alternative of stacked vertically like within the picture above. Go to your App.css file and add the next code:
.tab-button-container{
show: flex;
}
Recall that we added className=”tab-button-container” as an attribute within the div tag holding the three-tab buttons. Right here, we styled that container, utilizing CSS to set its show to flex. That is the outcome:
Be happy with how a lot you’ve completed to get up to now. Within the subsequent part, we are going to create our editors, changing the p tags with them.
Creating the Editors
As a result of now we have already put in the libraries we’re going to be engaged on inside our CodeMirror editor, let’s go forward and create our Editor.jsx file within the elements folder.
elements > Editor.jsx
Having created our new file, let’s write some preliminary code in it:
import ‘codemirror/lib/codemirror.css’;
import { Managed as ControlledEditorComponent } from ‘react-codemirror2’;
const Editor = ({ language, worth, setEditorState }) => {
return (
<div className=”editor-container”>
</div>
)
}
export default Editor
Here is what we did:
We imported React alongside the useState hook as a result of we’re going to want it.
We imported the CodeMirror CSS file (which comes from the CodeMirror library that we put in, so that you don’t have to put in it in any particular method).
We imported Managed from react-codemirror2, renaming it to ControlledEditorComponent to make it clearer. We will likely be utilizing this shortly.
Then, we declared our Editor practical element, and now we have a return assertion with an empty div, with a className within the return assertion for now.
In our practical element, we destructured some values from the props, together with language, worth, and setEditorState. These three props could be provided in any occasion of the editor when it’s referred to as in App.js.
Let’s use ControlledEditorComponent to put in writing the code for our editor. Right here’s what we’ll do:
import ‘codemirror/lib/codemirror.css’;
import ‘codemirror/mode/xml/xml’;
import ‘codemirror/mode/javascript/javascript’;
import ‘codemirror/mode/css/css’;
import { Managed as ControlledEditorComponent } from ‘react-codemirror2’;
const Editor = ({ language, worth, setEditorState }) => {
return (
<div className=”editor-container”>
<ControlledEditorComponent
onBeforeChange={handleChange}
worth= {worth}
className=”code-mirror-wrapper”
choices={{
lineWrapping: true,
lint: true,
mode: language,
lineNumbers: true,
}}
/>
</div>
)
}
export default Editor
Let’s stroll via what we did right here, explaining some CodeMirror phrases.
The CodeMirror modes specify which language an editor is supposed for. We imported three modes as a result of now we have three editors for this undertaking:
XML: This mode is for HTML. It makes use of the time period XML.
JavaScript: This (codemirror/mode/javascript/javascript) brings in JavaScript mode.
CSS: This (codemirror/mode/css/css) brings in CSS mode.
Notice: As a result of the editor is constructed as a element that’s reusable, we can’t put a direct mode within the editor. So, we provide the mode via the language prop that we destructured. However this doesn’t change the truth that the modes must be imported with a purpose to work.
Subsequent, let’s focus on the issues in ControlledEditorComponent:
onBeforeChange
That is referred to as anytime you write to or take away from the editor. Consider this just like the onChange handler you’ll usually have in an enter area to trace adjustments. Utilizing this, we will get the worth of our editor anytime there is a new change and reserve it to our editor’s state. We’ll write the {handleChange} operate as we proceed.
worth = {worth}
That is simply the content material of the editor at any given time. We handed a destructured prop named worth to this attribute. The worth props is the state holding the worth of that editor. This could be provided from the editor’s occasion.
className=”code-mirror-wrapper”
This class identify is just not a method we make ourselves. It’s provided from CodeMirror’s CSS file, which we imported above.
choices
That is an object that takes the totally different performance we wish our editor to have. There are a lot of superb choices in CodeMirror. Let’s take a look at those we used right here:
lineWrapping: true
Which means code ought to wrap to the following line when the road is full.
lint: true
This permits linting.
mode: language
This mode, as mentioned above, takes the language that the editor goes for use for. The language has already been imported above, however the editor goes to use a language based mostly on the language worth provided to the editor through the prop.
lineNumbers: true
This specifies that the editor ought to have line numbers for every line.
Subsequent, we will write the handleChange operate for the onBeforeChange handler:
const handleChange = (editor, knowledge, worth) => {
setEditorState(worth);
}
The onBeforeChange handler offers us entry to 3 issues: editor, knowledge, worth.
We solely want the worth as a result of it’s what we need to go in our setEditorState prop. The setEditorState prop represents the set worth for every state that we declared in App.js, holding the worth for every editor. As we transfer on, we are going to take a look at easy methods to go this as a prop to the Editor element.
Subsequent, we’ll add a dropdown that enables us to pick totally different themes for the editor. So, let’s take a look at themes in CodeMirror.
CodeMirror Themes
CodeMirror has a number of themes we will choose from. Go to the official web site to see demos of the totally different themes obtainable. Let’s make a dropdown with totally different themes that the consumer can select from in our editor. For this tutorial, we’ll be including 5 themes, however you’ll be able to add as many as you want.
First, let’s import our themes within the Editor.js element:
import ‘codemirror/theme/dracula.css’;
import ‘codemirror/theme/materials.css’;
import ‘codemirror/theme/mdn-like.css’;
import ‘codemirror/theme/the-matrix.css’;
import ‘codemirror/theme/evening.css’;
Subsequent, create an array of all the themes now we have imported:
Let’s declare a useState hook to carry the worth of the chosen theme, and set the default theme as dracula:
const [theme, setTheme] = useState(“dracula”)
Let’s create the dropdown:
…
return (
<div className=”editor-container”>
<div model={{marginBottom: “10px”}}>
<label for=”automobiles”>Select a theme: </label>
<choose identify=”theme” onChange={(el) => {
setTheme(el.goal.worth)
}}>
{
themeArray.map( theme => (
<choice worth={theme}>{theme}</choice>
))
}
</choose>
</div>
// the remainder of the code comes under…
</div>
)
…
Within the code above, we used the label HTML tag so as to add a label to our dropdown, after which added the choose HTML tag to create our dropdown. The choice tag within the choose component defines the choices obtainable within the dropdown.
As a result of we wanted to fill the dropdown with the theme names within the themeArray that we created, we used the .map array methodology to map themeArray and show the names individually utilizing the choice tag.
Maintain on — we’re not completed explaining the code above. Within the opening choose tag, we handed the onChange attribute to trace and replace the theme state every time a brand new worth is chosen within the dropdown. At any time when a brand new choice is chosen within the dropdown, the worth is gotten from the item returned to us. Subsequent, we use the setTheme from our state hook to set the brand new worth to be the worth that the state holds.
At this level, now we have created our dropdown, arrange our theme’s state, and written our operate to set the state with the brand new worth. The ultimate factor we have to do to make CodeMirror use our theme is go the theme to the choices object in ControlledEditorComponent. Within the choices object, let’s add a worth named theme, and set its worth to the state’s worth for the chosen theme, additionally named theme.
Right here’s what ControlledEditorComponent would appear like now:
<ControlledEditorComponent
onBeforeChange={handleChange}
worth= {worth}
className=”code-mirror-wrapper”
choices={{
lineWrapping: true,
lint: true,
mode: language,
lineNumbers: true,
theme: theme,
}}
/>
Now, now we have made a dropdown of various themes that may be chosen from within the editor.
Right here’s what the total code in Editor.js seems to be like in the mean time:
import ‘codemirror/lib/codemirror.css’;
import ‘codemirror/theme/dracula.css’;
import ‘codemirror/theme/materials.css’;
import ‘codemirror/theme/mdn-like.css’;
import ‘codemirror/theme/the-matrix.css’;
import ‘codemirror/theme/evening.css’;
import ‘codemirror/mode/xml/xml’;
import ‘codemirror/mode/javascript/javascript’;
import ‘codemirror/mode/css/css’;
import { Managed as ControlledEditorComponent } from ‘react-codemirror2’;
const Editor = ({ language, worth, setEditorState }) => {
const [theme, setTheme] = useState(“dracula”)
const handleChange = (editor, knowledge, worth) => {
setEditorState(worth);
}
const themeArray = [‘dracula’, ‘material’, ‘mdn-like’, ‘the-matrix’, ‘night’]
return (
<div className=”editor-container”>
<div model={{marginBottom: “10px”}}>
<label for=”themes”>Select a theme: </label>
<choose identify=”theme” onChange={(el) => {
setTheme(el.goal.worth)
}}>
{
themeArray.map( theme => (
<choice worth={theme}>{theme}</choice>
))
}
</choose>
</div>
<ControlledEditorComponent
onBeforeChange={handleChange}
worth= {worth}
className=”code-mirror-wrapper”
choices={{
lineWrapping: true,
lint: true,
mode: language,
lineNumbers: true,
theme: theme,
}}
/>
</div>
)
}
export default Editor
There’s just one className that we have to model. Go to App.css and add the next model:
.editor-container{
padding-top: 0.4%;
}
Now that our editors are prepared, let’s return to App.js and use them there.
src > App.js
The very first thing we have to do is import the Editor.js element in right here:
import Editor from ‘./elements/Editor’;
In App.js, let’s declare the states that can maintain the contents of the HTML, CSS, and JavaScript editors, respectively.
const [html, setHtml] = useState(”);
const [css, setCss] = useState(”);
const [js, setJs] = useState(”);
In case you recall, we might want to use these states to carry and provide the contents of our editors.
Subsequent, let’s substitute the paragraph (p) tags that we used for the HTML, CSS, and JavaScript within the conditional renderings with the editor elements now we have simply created, and we’ll additionally go within the applicable prop to every occasion of the editor element:
operate App() {
…
return (
<div className=”App”>
<p>Welcome to the edior</p>
// That is the place the tab buttons container is…
<div className=”editor-container”>
{
htmlEditorIsOpen ? (
<Editor
language=”xml”
worth={html}
setEditorState={setHtml}
/>
) : cssEditorIsOpen ? (
<Editor
language=”css”
worth={css}
setEditorState={setCss}
/>
) : (
<Editor
language=”javascript”
worth={js}
setEditorState={setJs}
/>
)
}
</div>
</div>
);
}
export default App;
In case you’ve been following alongside till now, you’ll perceive what we did within the code block above.
Right here it’s in plain English: We changed the p tags (which had been there as placeholders) with cases of the editor elements. Then, we provided their language, worth, and setEditorState props, respectively, to match their corresponding states.
We have come thus far! Here’s what our app seems to be like now:
Introduction to Iframes
We’ll be making use of inline frames (iframes) to show the results of the code entered within the editor.
In response to MDN:
The HTML Inline Body component (<iframe>) represents a nested searching context, embedding one other HTML web page into the present one.
How Iframes Work in React
Iframes are usually used with plain HTML. Utilizing Iframes with React doesn’t require many adjustments, the most important one being to transform attribute names to camelcase. An instance of that is that srcdoc would turn into srcDoc.
The Way forward for Iframes on the Internet
Iframes proceed to be actually helpful in internet improvement. One thing you may need to try is Portals. As Daniel Mind explains:
“Portals introduce a strong new set of capabilities into this combine. Now it’s doable to construct one thing that appears like an iframe, that may seamlessly animate and morph and take over the total browser window.”
One of many issues Portals tries to resolve is the URL bar drawback. When utilizing iframe, elements rendered within the iframe don’t carry a novel URL within the handle bar; as such, this won’t be nice for the consumer expertise, relying on the use case. Portals is price trying out, and I’d recommend you do this, however as a result of it’s not the main focus of our article, that is all I’ll say about it right here.
Creating the Iframe to Home Our End result
Let’s transfer forward with our tutorial by creating an iframe to deal with the results of our editors.
return (
<div className=”App”>
// …
<div>
<iframe
srcDoc={srcDoc}
title=”output”
sandbox=”allow-scripts”
frameBorder=”1″
width=”100%”
peak=”100%”
/>
</div>
</div>
);
Right here, we created the iframe and housed it in a div container tag. Within the iframe, we handed some attributes that we’d like:
srcDoc
The srcDoc attribute is written in camelcase as a result of that is easy methods to write iframe attributes in React. When utilizing an iframe, we will both embed an exterior internet web page on the web page or render specified HTML content material. To load and embed an exterior web page, we might use the src property as an alternative. In our case, we aren’t loading an exterior web page; reasonably, we need to create a brand new inner HTML doc that homes our outcome; for this, we’d like the srcDoc attribute. This attribute takes the HTML doc that we need to embed (now we have not created that but, however we are going to quickly).
title
The title attribute is used to explain the contents of the inline body.
sandbox
This property has many functions. In our case, we’re utilizing it to permit scripts to run in our iframe with the allow-scripts worth. As a result of we’re working with a JavaScript editor, this may come in useful shortly.
frameBorder
This merely defines the border thickness of the iframe.
width and peak
This defines the width and peak of the iframe.
These phrases ought to now make extra sense to you. Let’s transfer on and declare the state that can maintain the HTML template doc for srcDoc. In case you look carefully on the code block above, you’ll see that we handed a worth to the srcDoc attribute: srcDoc={srcDoc}. Let’s use our useState() React hook to declare the srcDoc state. To do that, within the App.js file, go to the place we outlined the opposite states and add this one:
const [srcDoc, setSrcDoc] = useState(` `);
Now that now we have created the state, the following factor to do is show the outcome within the state every time we kind within the code editor. However what we don’t need is to re-render the element on each single key press. With that in thoughts, let’s proceed.
Configuring the Iframe to Show the End result
Each time there is a change in any of the editors for the HTML, CSS, and JavaScript, respectively, we wish useEffect() to be triggered, and that can render the up to date outcome within the iframe. Let’s write useEffect() to do that within the App.js file:
First, import the useEffect() hook:
import React, { useState, useEffect } from ‘react’;
Let’s write useEffect() like so:
useEffect(() => {
const timeOut = setTimeout(() => {
setSrcDoc(
`
<html>
<physique>${html}</physique>
<model>${css}</model>
<script>${js}</script>
</html>
`
)
}, 250);
return () => clearTimeout(timeOut)
}, [html, css, js])
Right here, we wrote a useEffect() hook that can all the time run every time the worth states that we declared for the HTML, CSS, and JavaScript editors are modified or up to date.
Why did we have to use setTimeout()? Nicely, if we wrote this with out it, then each time a single key press is made in an editor, our iframe could be up to date, and that isn’t nice for efficiency typically. So we use setTimeout() to delay the replace for 250 milliseconds, giving us sufficient time to know whether or not the consumer remains to be typing. That’s, each time the consumer presses a key, it restarts the rely, so the iframe would solely be up to date when the consumer has been idle (not typing) for 250 milliseconds. It is a cool method to keep away from having to replace the iframe each time a secret’s pressed.
The following factor we did above was to replace srcDoc with the brand new adjustments. The srcDoc element, as we defined above, renders specified HTML content material within the iframe. In our code, we handed an HTML template, taking the html state that accommodates the code that the consumer has typed into the HTML editor and inserting it between the physique tags of our template. We additionally took the css state that accommodates the types that the consumer has typed within the CSS editor, and we handed that between the model tags. Lastly, we took the js state that accommodates the JavaScript code that the consumer has typed within the JavaScript editor, and we handed it between the script tags.
Discover that in setting setSrcDoc, we used backticks (` `) as an alternative of regular quotes (‘ ‘). It’s because backticks enable us to go in corresponding state values, as we did within the code above.
The return assertion within the useEffect() hook is a cleanup operate that clears setTimeout() when it’s full, to keep away from reminiscence leakage. The documentation has extra about useEffect.
Right here’s what our undertaking seems to be like in the mean time:
CodeMirror Addons
With CodeMirror addons, we will improve our editor with extra of the type of performance we might discover in different code editors. Let’s stroll via an instance of closing tags being added routinely when a gap tag is typed, and one other instance of a bracket routinely closing when the opening bracket is inputted:
The very first thing to do is import the addon for this into our App.js file:
import ‘codemirror/addon/edit/closetag’;
import ‘codemirror/addon/edit/closebrackets’;
Let’s go it within the ControlledEditorComponent choices:
<ControlledEditorComponent
…
choices={{
…
autoCloseTags: true,
autoCloseBrackets: true,
}}
/>
Now right here’s what now we have:
You could possibly add a ton of those addons to your editor to offer it richer options. We couldn’t presumably undergo all of them right here.
Now that we’re completed with this, let’s briefly focus on issues we may do to enhance our app’s accessibility and efficiency.
Efficiency and Accessibility of the Answer
Taking a look at our internet code editor, some issues may undoubtedly be improved upon.
As a result of we’ve paid consideration primarily to performance, we’d have uncared for design just a little bit. For higher accessibility, listed below are some issues you might do to enhance this resolution:
You could possibly set an energetic class on the button for the at present open editor. Highlighting the button would enhance accessibility by giving customers a transparent indication of which editor they’re at present engaged on.
You may want the editor to occupy extra display area than what now we have right here. One other factor you might strive is making the iframe pop up with the press of a button that’s docked someplace to the aspect. Doing so would give the editor extra display area.
This form of editor could be helpful for individuals who need to run a fast train on their cell system, so absolutely adapting it to cell could be mandatory (to not point out each of the factors about cell above).
Presently, we’re in a position to change the theme of the editor element from among the many a number of themes we’ve loaded in, however the basic theme of the web page stays the identical. You could possibly allow the consumer to modify between a darkish and lightweight theme for your complete structure. This could be good for accessibility, relieving the pressure on folks’s eyes from a vivid display for too lengthy.
We didn’t take a look at safety points with our iframe, primarily as a result of we had been loading an inner HTML doc within the iframe, reasonably than an exterior doc. So we don’t want to think about this too fastidiously as a result of iframes are a great match for our use case.
With iframes, one other consideration could be page-loading time, as a result of the content material being loaded within the iframe would usually be out of your management. In our app, this isn’t a problem as a result of our iframe content material isn’t exterior.
Efficiency and accessibility are price loads of consideration once you’re constructing any utility as a result of they’ll decide how helpful and usable your utility is to its customers.
Shedrack has completed a great job of explaining strategies for bettering and optimizing efficiency in React apps. It’s price trying out!
Conclusion
Working via totally different tasks helps us to find out about a variety of topics. Now that you just’ve gone via this text, be happy to develop upon your expertise by experimenting with extra add-ons to make the code editor richer, revamping the UI, and fixing the accessibility and efficiency considerations outlined above.
All the code base for this undertaking is obtainable on GitHub.
Right here’s the demo on Codesandbox:
Hyperlinks and Materials
“Google Chrome’s Portals: Like Iframes, However Higher, and Worse”, Daniel Mind
“Optimizing Efficiency”, React documentation
“Person Guide and Reference Information”, CodeMirror documentation
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