關於 CSS 中 :visited 的隱私問題_html/css

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關於 CSS 中 :visited 的隱私問題_html/css_WEB-ITnose

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Jun 21, 2016 am 08:57 AM

在七年半前 (2008 年八月) 寫的「利用 CSS 產生的隱私問題」文章，最近好像是因為 Rplus Chen在 Facebook上的這邊提到而又有不少點擊進來，不過這個問題在 2010 年左右已經被解決了。

可以參考 MDN上「 :visited - CSS」的說明，以及當時 Mozilla所發佈的文章：「 privacy-related changes coming to CSS :visited」。

由於隱私問題，Mozilla 的作法是限制 :visited可以改變的項目，只剩下少數與呈現方式有關的屬性可以用：

For privacy reasons, browsers strictly limit the styles you can apply using an element selected by this pseudo-class: only color, background-color, border-color, border-bottom-color, border-left-color, border-right-color, border-top-color, outline-color, column-rule-color, filland stroke.

另外各種想要取得 :visited的 CSS 資訊的方法，也會以沒有瀏覽過該網站重新計算，並且傳回假資料以確保還是不會洩漏：

The first change is that Gecko will lie to web applications under certain circumstances. In particular, getComputedStyle()and similar functions such as element.querySelector()always return values indicating that a user has never visited any of the links on a page.

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