Web標(biāo)注的語(yǔ)義化是高效Web編碼、信息架構(gòu)、通用可用性、搜索引擎可見性以及最大顯示靈活性的核心概念基礎(chǔ)。可以通過Web瀏覽器、各種移動(dòng)計(jì)算設(shè)計(jì)和屏幕閱讀器來訪問Web內(nèi)容。也可以通過搜索引擎以及其他能從HTML標(biāo)注內(nèi)容的方式中提取含義和上下文的計(jì)算系統(tǒng)來閱讀Web內(nèi)容。
<h1>This is the most important headline</h1>
<p>This is ordinary paragraph text within the body of the document, where certain words and phrases may be<em> emphasized</em> to mark them as <strong>particularly important</strong>.</p >
<h2>This is a headline of secondary importance to the headline above</h2>
<p>Any time you list related things, the items should be marked up in the form of a list:</p > <ul>
<li>A list signals that a group of items are conceptually related to each other</li> <li>Lists may be ordered (numbered or alphabetic) or unordered(bulleted items)</li> <li>Lists may also be menus or lists of links for navigation</1i> <li>Cascading style Sheets can make lists look many different ways</li></ul>
即使在上面這個(gè)簡(jiǎn)單的實(shí)例中,搜索引擎也能區(qū)分標(biāo)題的重要性和優(yōu)先級(jí)別,發(fā)覺哪些網(wǎng)站制作關(guān)鍵字是重要的,并且識(shí)別列表中概念上相關(guān)的項(xiàng)。專門針對(duì)手機(jī)設(shè)計(jì)的層疊樣式表可以采用適合小屏幕的字體顯示標(biāo)題和文字,屏幕閱讀軟件知道在哪以及如何通過暫停或變換語(yǔ)音來向盲人讀者傳遞有關(guān)內(nèi)容結(jié)構(gòu)的信息。
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