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HTML

              
                h1 CSS triangle generator
.main
  .ctrl
    ul#values
      li
        label
          span size
          input(name='size', type='range', min='0', max='400', step='any', value='200')
      li
        label
          span height
          input(name='height', type='range', min='0', max='2', step='any', value='0.5')
          button(data-preset='height:0.5') 1:2
          button(data-preset='height:1') 1:1
          button(data-preset='height:0.866', onclick='iso.click()') √3:2 (equilateral)
      li
        label
          span angle
          input(name='angle', type='range', min='-1', max='1', step='any', value='0')
          button#iso(data-preset='angle:0') isosceles
    ul#direction
      li
        label
          input(type='radio', name='dir', value='top', checked='')
          span ↑
      li
        label
          input(type='radio', name='dir', value='right')
          span →
      li
        label
          input(type='radio', name='dir', value='bottom')
          span ↓
      li
        label
          input(type='radio', name='dir', value='left')
          span ←
  .out
    pre.
    div.tri
      input#show(type='checkbox', name='')
      label(for='show')  show all borders
      #triangle

              
            
!

CSS

              
                *
*:before
*:after
  box-sizing border-box
html
  font-size 16px

h1
  text-align center
  font-weight normal
  font-size 1.5em
  margin 0.5em


ul,li
  display block
  list-style none
  padding 0
  margin 0


#show:checked~#triangle
  transition border 0.3s
  border-color hsl(160, 0%, 20%) hsl(150, 0%, 10%) !important
  filter none

.tri
  margin 20px

#triangle
  //transition border .3s
  width 0
  margin-top 20px
  filter drop-shadow(0 0 5px rgba(#f,.5))


#values
  padding 0
  display block
  list-style none
  
  >li
    background rgba(#000, 0.1)
    padding 1px
    margin 10px 0
  
  label
    margin 10px 0
    display block
  
  span
    display inline-block
    width 50px
    text-align right
    vertical-align middle
  
  input
    vertical-align middle
    width 300px
  


#direction
  background rgba(#000, .1)
  padding 10px
  font-size 1.5em
  
  >li
    text-align center
    display inline-block
    
    input
      display none
      
      &:checked+span
        background #363
        color white
        text-shadow 0 0 5px white
        box-shadow 0px 0px 0px 1px rgba(#fff, 0.5)
    
    span
      display block
      background #444
      vertical-align middle
      line-height 1.3
      padding 0px 0px
      width 1.5em
      height 1.5em
      transition .3s background-color
      box-shadow 0px 0px 0px 1px rgba(#fff, 0.3)
      
      &:hover
        background-color #336

html
  background #258
  color #ace
  min-height 100%
  margin 10px

pre
  background-color rgba(0, 0, 0, 0.5)
  margin 20px -10px
  color #fff
  padding 10px
  
  .prop
    color #ff3
  
  .value
    color #5ff
  
  .size
    color #f55

button
  background #444
  border none
  color #ddd
  margin-left 10px
  //border-radius 0.2em
  vertical-align middle
  padding .1em .2em !important
  box-shadow 0px 0px 0px 1px rgba(#fff, 0.3)
  transition .3s background-color
  
  &:hover
    background #336
    box-shadow 0px 0px 0px 1px rgba(#fff, 0.5)
  
  &:before
    content '◎ '
    // content '◇ '
    font-size 1em
    line-height 1
    vertical-align middle
    color #fff
    display inline-block
    margin-right 5px
    // padding-right 5px
    // border-right 1px solid #999
  
  &:disabled
    //box-shadow none
    background-color #363
    pointer-events none
    
    &:before
      content '◉ '
      // content '◈ '

.main
  border-top 1px solid transparent
  
@media (min-width 1111px)
  pre
    margin 10px 0
  .main
    display flex
  .ctrl
    flex-grow 1
  .out
    margin-left 10px
    width 600px
    
.main
  border-top 1px solid transparent
@media (max-width 1110px) and (max-height 600px)
  .out
    display flex
    flex-wrap wrap
    align-items flex-start
    >*
      flex 1 1 0
              
            
!

JS

              
                const rng = document.queryAll('#values input[type=range]')
const pst = document.queryAll('[data-preset]')
const tri = document.query('#triangle')
const pre = document.query('pre')
const val = {}
const bdr = ['top', 'right', 'bottom', 'left']
let dir  = document.queryAll('#direction input')

rng.forEach((elm) => {
  val[elm.name] = +elm.value
})

draw()

pst.forEach((btn) => {
  const data = btn.dataset.preset.split(':')
  const input = rng.find((a) => a.name === data[0])
  const val = data[1]
  
  const event = document.createEvent('Event');
  event.initEvent('input', true, false);
  
  function checkButton(){
    btn.disabled = (input.value === val)
  }
  input.addEventListener('input', checkButton)
  btn.addEventListener('click', () => {
    input.value = val
    input.dispatchEvent(event);
    checkButton()
  })
  checkButton()
})

rng.forEach((elm) => {
  elm.addEventListener('input', () => {
    val[elm.name] = +elm.value
    draw()
  })
})

dir.forEach((elm) => {
  elm.addEventListener('change', () => {
    dir = elm.value
    while (bdr[0] !== dir)
      bdr.push(bdr.shift())
    draw()
  })
})

dir = dir.find((elm) => elm.checked).value

draw()

function draw() {
  let style = ''
  const css = {
    width: '0',
    height: '0',
    border: '0 solid transparent'
  }
  css['border-' + bdr[1] + '-width'] = Math.round(val.size * (-val.angle + 1) / 2) + 'px'
  css['border-' + bdr[3] + '-width'] = Math.round(val.size * (val.angle + 1) / 2) + 'px'
  css['border-' + bdr[2]] = Math.round(val.size * val.height) + 'px solid black'

  Object.assign(tri.style, css)

  Object.entries(css).forEach(([k, v]) => {
    v = v.replace(/(\d+(px)?)/g, '<span class="size">$1</span>')
    style += '<span class="prop">' + k + '</span>: <span class="value">' + v + '</span>;\n'
  })

  pre.innerHTML = style

}
              
            
!
999px

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