img:not([alt]):before,
img:not([title]):before,
img[alt=""]:before,
img[title=""]:before,
a:not([title]):before,
a[title=""]:before,
a:not([title]) *:before,
a[title=""] *:before,
a[href*="["]:before,
a[href*="]"]:before
{
    background-color: white;
    box-shadow: 0 0 0 1px red;
    color: red;
    display: inline-block;
    font-weight: bold;
    line-height: 1em;
    margin-top: -3em;
    padding: 0.5em;
    position: absolute;
    width: 150px;
}

img:not([title]):before,
img[title=""]:before
{
    content: "Missing attribute (alt)";
}

img[alt=""]:before,
img:not([alt]):before
{
    content: "Missing attribute (title)";
}


img:not([title]):before.img:not([alt]):before,
img[title=""]:before.img[alt=""]:before
{
    content: "Missing attribute (title, alt)";
}

a:not([title]):before,
a[title=""]:before,
a:not([title]) *:before,
a[title=""] *:before
{
    content: "Missing attribute (title)";
}

a[href*="["]:before,
a[href*="]"]:before
{
    content: "Placeholder was not replaced";
}

.gm-style img:not([alt]):before,
.gm-style img:not([title]):before,
.gm-style a:not([title]):before,
.gm-style img[alt=""]:before,
.gm-style img[title=""]:before,
.gm-style a[title=""]:before,
.gm-style a:not([title]) *:before,
.gm-style a[title=""] *:before
{
    display: none;
}

a.anchor:before,
.mce-container a:before
{
    display: none;
}