mediawiki-extensions-VisualEditor/modules/ve2/ce/styles/ve.ce.Node.css

.ve-ce-alienBlockNode {
	background-color: rgb(255,255,186) rgba(255,255,186,0.3);
	border: rgba(0,0,0,0.3) dashed 1px;
	display: block;
}

.ve-ce-alienInlineNode {
	background-color: rgb(255,255,186) rgba(255,255,186,0.3);
	border: rgba(0,0,0,0.3) dashed 1px;
	display: inline;
}

.ve-ce-slug {
	/*display: inline-block;
	margin-right: -1px;
	width: 1px;*/
}

.ve-ce-branchNode h1:empty:before,
.ve-ce-branchNode h2:empty:before,
.ve-ce-branchNode h3:empty:before,
.ve-ce-branchNode h4:empty:before,
.ve-ce-branchNode h5:empty:before,
.ve-ce-branchNode h6:empty:before,
.ve-ce-branchNode p:empty:before {
	content: url('data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==');
}