Bug on img

[fabbrikk]

When appling on an img tag something like this:

#div img{
    max-height: 40vh;
    content: 'viewport-units-buggyfill; max-height: 40vh;';
}

the img disapear. A workaround can be use moodernizr to inject cssvhunit class to html, and then in css add this rule:

.cssvhunit #div img{
    content: normal !important;
}

[rodneyrehm]

thanks for the hint! I added a note to the readme.