[css] Detect if an input has text in it using CSS -- on a page I am visiting and do not control?

The valid selector will do the trick.

<input type="text" class="myText" required="required" />

.myText {
    //default style of input
}
.myText:valid {
    //style when input has text
}

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Detect if an input has text in it using CSS -- on a page I am visiting and do not control?