HTML

<button id="dipBrushButton">Dip brush</button>
<button id="applyBrushButton">Apply brush</button>
<p id="brushParagraph">Brush color: none</p>

JavaScript

let dipBrushButton = document.getElementById(`dipBrushButton`)
let applyBrushButton = document.getElementById(`applyBrushButton`)
let brushParagraph = document.getElementById(`brushParagraph`)
  
let paintbrush

dipBrushButton.addEventListener(`click`, dipBrush)
applyBrushButton.addEventListener(`click`, applyBrush)

function dipBrush() {
  // your code will appear here
  brushParagraph.innerHTML = `Brush color: ${paintbrush}`
}

function applyBrush() {
  this.style.backgroundColor = paintbrush
}

Your code

HTML

<button id="selectOpacityButton">Select opacity</button>
<button id="applyOpacityButton">Apply opacity</button>
<p id="opacityParagraph">Selected opacity: none</p>

JavaScript

let selectOpacityButton = document.getElementById(`selectOpacityButton`)
let applyOpacityButton = document.getElementById(`applyOpacityButton`)
let opacityParagraph = document.getElementById(`opacityParagraph`)
  
let opacity

selectOpacityButton.addEventListener(`click`, selectOpacity)
applyOpacityButton.addEventListener(`click`, applyOpacity)

function selectOpacity() {
  // your code will appear here
  opacityParagraph.innerHTML = `Selected opacity: ${opacity}`
}

function applyOpacity() {
  this.style.opacity = opacity
}

Your code

HTML

<button id="selectFontSizeButton">Select font size</button>
<button id="applyFontSizeButton">Apply font size</button>
<p id="fontSizeParagraph">Selected font size: none</p>

JavaScript

let selectFontSizeButton = document.getElementById(`selectFontSizeButton`)
let applyFontSizeButton = document.getElementById(`applyFontSizeButton`)
let fontSizeParagraph = document.getElementById(`fontSizeParagraph`)
  
let fontSize

selectFontSizeButton.addEventListener(`click`, selectFontSize)
applyFontSizeButton.addEventListener(`click`, applyFontSize)

function selectFontSize() {
  // your code will appear here
  fontSizeParagraph.innerHTML = `Selected font size: ${fontSize}px`
}

function applyFontSize() {
  fontSizeParagraph.style.fontSize = `${fontSize}px`
}

Your code

HTML

<button id="selectWidthButton">Select width</button>
<button id="applyWidthButton">Apply width</button>
<p id="widthParagraph">Selected width: none</p>

JavaScript

let selectWidthButton = document.getElementById(`selectWidthButton`)
let applyWidthButton = document.getElementById(`applyWidthButton`)
let widthParagraph = document.getElementById(`widthParagraph`)
  
let width

selectWidthButton.addEventListener(`click`, selectWidth)
applyWidthButton.addEventListener(`click`, applyWidth)

function selectWidth() {
  // your code will appear here
  widthParagraph.innerHTML = `Selected width: ${width}px`
}

function applyWidth() {
  this.style.width = `${width}px`
}

Your code

HTML

<button id="selectRotationButton">Select rotation</button>
<button id="applyRotationButton">Apply rotation</button>
<p id="rotationParagraph">Selected rotation: none</p>

JavaScript

let selectRotationButton = document.getElementById(`selectRotationButton`)
let applyRotationButton = document.getElementById(`applyRotationButton`)
let rotationParagraph = document.getElementById(`rotationParagraph`)
  
let rotation

selectRotationButton.addEventListener(`click`, selectRotation)
applyRotationButton.addEventListener(`click`, applyRotation)

function selectRotation() {
  // your code will appear here
  rotationParagraph.innerHTML = `Selected rotation: rotate(${rotation}deg)`
}

function applyRotation() {
  this.style.transform = `rotate(${rotation}deg)`
}

Your code

HTML

<button id="cartButton">Add to cart</button>
<button id="checkoutButton">Checkout</button>
<p id="cartParagraph">Items in cart: 0</p>
<p id="costParagraph">Cost per item: $10</p>
<p id="checkoutParagraph">Total cost: $0</p>

JavaScript

let cartButton = document.getElementById(`cartButton`)
let checkoutButton = document.getElementById(`checkoutButton`)
let cartParagraph = document.getElementById(`cartParagraph`)
let checkoutParagraph = document.getElementById(`checkoutParagraph`)
  
let items = 0

cartButton.addEventListener(`click`, addToCart)
checkoutButton.addEventListener(`click`, checkout)

function addToCart() {
  // your code will appear here
  cartParagraph.innerHTML = `Items in cart: ${items}`
}

function checkout() {
  checkoutParagraph.innerHTML = `Total cost: $${items * 10}`
}

Your code