rjv

@mixin rem($property, $values) {
  // Create a couple of empty lists as output buffers.
  $base-font-size: 16px; // should be consistent with your html/body font-size
  $px-values: ();
  $rem-values: ();

  // Loop through the $values list
  @each $value in $values {
    // For each property value, if it's in rem or px, derive both rem and
    // px values for it and add those to the end of the appropriate buffer.

rjv

<?php

function get_thumbnail_url($post_id = null, $size = 'medium')
{
    global $post;

    if (is_string($post_id)) {
        $size    = $post_id;
        $post_id = $post->ID;
    }

rjv

document.querySelectorAll('[target=_blank]').forEach(function(target) {
  target.setAttribute("rel", "noopener noreferrer");
});