The specificity of [My ID] surpasses that of [parent ID]
Contrary to popular belief, an ID stands alone in its specificity. The crucial factor in your scenario is identifying the particular element to which it is assigned.
In the context of [parent ID], the [descendant combinator (space)] [my class] holds greater specificity than [my ID]
Indeed, it is a valid statement, and it denotes higher specificity. Referring to the W3C's abc model:
#child { // 1, 0, 0 = 100 Specificity }
#parent .foo { // 1, 1, 0 = 110 Specificity }
#parent #child { // 2, 0, 0 = 200 Specificity }
#parent #child.foo { // 2, 1, 0 = 210 Specificity }
Therefore, #parent .foo
takes precedence over #child
, while #parent #child
trumps #parent .foo
#parent { /* 100 */
color: blue;
}
#parent .foo { /* 110 */
color: green;
}
#child { /* 100 */
color: red;
}
#parent #child { /* 200 */
color: aqua;
}
<div id="parent">
<div id="child" class="foo bar">what color am I?</div>
</div>