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    <p>Every sequence of simple selectors and combinators is read by browsers from right to left, in a linear fashion. Combinators do not affect the ordering in any way. The rightmost selector, after the last combinator if any, is known as the <em>key selector</em> (see the reference links below for more), and that identifies the element that the rule applies to (also known as the <em>subject</em> of the selector, although note that the key selector may not always represent the subject of the selector, since different applications implement selectors differently).</p> <p>The selector <code>#id1 #id2 + #id3</code> means</p> <blockquote> <p>Select element <code>#id3</code><br> if it directly follows as a sibling of <code>#id2</code><br> that is a descendant of <code>#id1</code>.</p> </blockquote> <p>A DOM structure in which <code>#id3</code> would match the selector would look like this:</p> <pre><code>#id1 ... any level of nesting #id2 #id3 </code></pre> <p>While <code>#id1 + #id2 #id3</code> means</p> <blockquote> <p>Select element <code>#id3</code><br> if it is a descendant of <code>#id2</code><br> that directly follows as a sibling of <code>#id1</code>.</p> </blockquote> <p>And a DOM structure in which <code>#id3</code> would match the selector would look like this:</p> <pre><code>#id1 #id2 ... any level of nesting #id3 </code></pre> <p>Notice the difference in the position of element <code>#id2</code> in this DOM structure, as compared to the one above.</p> <p>There isn't much of a precedence issue here since the descendant and sibling combinators go in different directions in the DOM. Both selector sequences read right to left either way.</p> <p>Related answers:</p> <ul> <li><a href="https://stackoverflow.com/questions/3851635/css-combinator-precedence/3851754#3851754">CSS combinator precedence?</a></li> <li><a href="https://stackoverflow.com/questions/5478920/css-selector-are-parentheses-allowed/5478943#5478943">Are parentheses allowed in CSS selectors?</a></li> <li><a href="https://stackoverflow.com/questions/6886900/css-adjacent-selector-meaning/6887175#6887175">CSS Adjacent Selector / Meaning</a></li> </ul>
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    1. POWhat's the precedence of the + operator in CSS selectors?
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    1. POWhat's the precedence of the + operator in CSS selectors?
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    1. CONow that I think about it, I believe even if parenthesis were allowed, then the expressions `#id1 (#id2 + #id3)` and `(#id1 #id2) + #id3` would be equivalent. Am I right?
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    2. CO@ripper234: I would agree!
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