I would put 100% at understanding completely the language and all of its quirks, functionalities and more. Some are easier to know than others take HTML there is a finite number of tags in HTML5 and it is easy to know them all. The rating also helps to show within all the skills and competencies which one you are more comfortable with and good with. This is however a personal take, some people might buff it up and when it comes to practical exam they will fail.
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I would put 100% at understanding completely the language and all of its quirks, functionalities and more. Some are easier to know than others take HTML there is a finite number of tags in HTML5 and it is easy to know them all. The rating also helps to show within all the skills and competencies which one you are more comfortable with and good with. This is however a personal take, some people might buff it up and when it comes to practical exam they will fail.