Simple HTML If eval

if.html.js

// function $$(selector, context) {
//   context = context || document;
//   var elements = context.querySelectorAll(selector);
//   return Array.prototype.slice.call(elements);
// }

let html = $$('html')[0].innerHTML
let result

while (result = /{{#if.+}}[^]+?{{\/if}}/g.exec(html)) {
  let block = result[0]
  let expr = /{{#if \((.+)\)}}/y.exec(block)[1]
  let content = /{{#if.+}}([^]+){{\/if}}/y.exec(block)[1]

  if (!eval(expr))
    $$('html')[0].innerHTML = html.replace(block, '')
  else
    $$('html')[0].innerHTML = html.replace(block, content)

  html = $$('html')[0].innerHTML
}