Upon reviewing the code of various websites such as Netflix and W3Schools, I came across an intriguing observation: upon inspecting certain elements (by using the Inspect Element feature in Firefox Developer Edition), most of the CSS rules/strings appeared to be crossed out. What could be the reason for this peculiar phenomenon? I have included two screenshots for reference - screenshot 1 displays numerous crossed lines, while screenshot 2 shows the expected element.1 2
Most of the rules that have been marked out are alternatives for certain web browsers.
-webkit refers to Chrome and Safari,
-moz corresponds to Firefox,
-o is associated with Opera, and
-ms stands for Internet Explorer.
Being crossed out does not necessarily equate to being deemed invalid, but rather indicates that a particular value is not being applied. This could be due to the value being found not valid or simply because it has been overwritten by another rule.
In the case of the values for left and right, they are indeed valid. However, they are not being applied as they have been overridden by a different rule.
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