function getInnerTextLength(node) {
		// ignore style, script, pre, textarea elements
		if (sensitive.indexOf(node.tagName) !== -1) {
			return 0
		}

		if (!node.children || !node.children.length) {
			return 0
		}

		var child = node.children[0];

		if (child.type === 'text' || child.type === 'comment') {
			return child.value.split('\n')[0].length
		}

		return 0
	}
Returns the text lenght of the first line of the first child.
Whitespace sensitive elements are ignored.
@param {*} node