css - Is it legal to position an at-rule inside a style block? -


the following valid css:

@media print {     .no_print {         display: none;     } } h1 {     font-family: verdana, arial, sans-serif;     font-size: 13px;     font-weight: bold;     margin-bottom: 12px; }

in following have placed @media statement inside h1 style block. valid css? googling, find examples of @media statements being placed inside 1 another. lack sufficient familiarity terminology of css refine search terms further in hope of answering question.

h1 {     font-family: verdana, arial, sans-serif;     font-size: 13px;     font-weight: bold;     margin-bottom: 12px;     @media print {         font-weight: normal;     } }

no, not valid. generally, at-rules (rules begins @) allowed @ start of style sheet only, general css principles. however, @media , @page rules allowed elsewhere, too, between rules, not inside rule. rule construct consists of list of selectors , set of declarations between braces, e.g. h1 { color: blue; line-height: 1 }. browsers required ignore misplaced at-rule (and do).

you put @media rule @ start, restrict effect h1 elements need specify in selector. due css cascade rules (which ignore media restrictiong in calculating specificity), need make selector more specific mere h1 (otherwise latter declaration wins); simple way use contextual selector body h1, not restrict meaning of selector, gives highet specificity:

@media print {     body h1 {         font-weight: normal;     } } h1 {     font-family: verdana, arial, sans-serif;     font-size: 13px;     font-weight: bold;     margin-bottom: 12px; }

if don’t put at-rules @ start, can make @media rule simpler:

h1 {     font-family: verdana, arial, sans-serif;     font-size: 13px;     font-weight: bold;     margin-bottom: 12px; } @media print {     h1 {         font-weight: normal;     } }

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