ID ã»ã¬ã¯ã¿ã¼

Baseline Widely available

This feature is well established and works across many devices and browser versions. Itâs been available across browsers since â¨2015å¹´7æâ©.

css

/* id="demo" ã®ã¤ããè¦ç´  */
#demo {
  border: red 2px solid;
}

æ§æ

css

#id_value { ã¹ã¿ã¤ã«ããããã£ }

css

[id=id_value] { ã¹ã¿ã¤ã«ããããã£ }

css

#identified {
  background-color: skyblue;
}

html

<div id="identified">ããã¯ç¹å¥ãª ID ãã¤ãã¦ãã¾ãï¼</div>
<div>ããã¯åãªãæ®éã® div ã§ãã</div>

Specification
Selectors Level 4 # id-selectors