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HTML 

              
                <h1>Tipografia Responsiva</h1>

<p>Parece que, usando <code>calc()</code> e vw, é possível ter tipografia responsiva que se adapta perfeitamente entre os valores de pixels específicos dentro de um intervalo de exibição específico.</p>

<p>O problema com a abordagem comum para tipografia responsiva é que há "pontos de quebra" que não permitem que o escalonamento de fonte seja fluido e é preciso usar um monta de media queries.</p>

<p>Unidades de viewport são fluidas, mas fica faltando um controle preciso sobre <code>font-size</code>.</p>

<p>Normalmente, é possível uma tabela como esta para ajudar a visualizar a mudança no <code>font-size</code> através de diferentes tamanhos de viewport:</p>

<table>
    <tbody>
        <tr>
            <th>Unidades de viewport:</th>
            <th>1vw</th>
            <th>2vw</th>
            <th>3vw</th>
            <th>4vw</th>
            <th>5vw</th>
        </tr>
        
        <tr>
            <th>Tamanho da viewport</th>
            <th colspan="5">font-size em pixels</th>
        </tr>
        
        <tr>
            <th>400px</th>
            <td>4px</td>
            <td>8px</td>
            <td>12px</td>
            <td>16px</td>
            <td>20px</td>
        </tr>
        
        <tr>
            <th>500px</th>
            <td>5px</td>
            <td>10px</td>
            <td>15px</td>
            <td>20px</td>
            <td>25px</td>
        </tr>
        
        <tr>
            <th>600px</th>
            <td>6px</td>
            <td>12px</td>
            <td>18px</td>
            <td>24px</td>
            <td>30px</td>
        </tr>
        
        <tr>
            <th>700px</th>
            <td>7px</td>
            <td>14px</td>
            <td>21px</td>
            <td>28px</td>
            <td>35px</td>
        </tr>
        
        <tr>
            <th>800px</th>
            <td>8px</td>
            <td>16px</td>
            <td>24px</td>
            <td>32px</td>
            <td>40px</td>
        </tr>
        
        <tr>
            <th>900px</th>
            <td>9px</td>
            <td>18px</td>
            <td>27px</td>
            <td>36px</td>
            <td>45px</td>
        </tr>
        
        <tr>
            <th>1000px</th>
            <td>10px</td>
            <td>20px</td>
            <td>30px</td>
            <td>40px</td>
            <td>50px</td>
        </tr>
        
        <tr>
            <th>1100px</th>
            <td>11px</td>
            <td>22px</td>
            <td>33px</td>
            <td>44px</td>
            <td>55px</td>
        </tr>
        
        <tr>
            <th>1200px</th>
            <td>12px</td>
            <td>24px</td>
            <td>36px</td>
            <td>48px</td>
            <td>60px</td>
        </tr>
    </tbody>
</table>

<p>Olhando a tabela, é possível ver que existem limitações. Por exemplo, não há como escalar entre 16px e 36px através dos tamanhos de viewport mostrados. É uma pena, porque esse é otipo de controle que designers esperam.</p>

<p>Imagine que seja preciso que o menor <code>font-size</code> seja 12px e, uma vez que a largura de viewport seja maior que 400px, é preciso que o tamanho da fonte gradualmente seja incrementado para 24px e pare de escalar quando a largura da viewport for 800px. Isso é <em>exatamente</em> o que este demo faz!</p>

<p>Isso é possível usando unidades de viewport em combinação com <code>calc()</code>.</p>

<p>Mais detalhes no artigo "<a target="blank" href=" http://desenvolvimentoparaweb.com/css/unidades-de-viewport-controle-tipografia-web-design-responsivo">Unidades de viewport: controle de tipografia em web design responsivo</a>"</p>
!

CSS 

              
                // Esses valores são o mínimo e máximo de tamanho de viewport 
// para aplicar no escalonamento de fontes
$min_width: 400;
$max_width: 800;

// Esses valores representam a extensão de font-size a aplicar
// Eles afetam o font-size base, cabeçalhos e outros elementos que escalam proporcionalmente
$min_font: 12;
$max_font: 24; 

:root { font-size: #{$min_font}px; }

// Aqui fica a parte feia
@media (min-width: #{$min_width}px) and (max-width: #{$max_width}px) {
    :root { 
        font-size: calc( #{$min_font}px + (#{$max_font} - #{$min_font}) * ( (100vw - #{$min_width}px) / ( #{$max_width} - #{$min_width}) ));
    }
}

@media (min-width: #{$max_width}px) {
    :root { 
        font-size: #{$max_font}px;
    }
}



// Não relacionado a esta técnica
body {
    padding: 0 1em;
}

table {
    border-collapse: collapse;
    border-spacing: 0px;
    border: 1px solid #cbcbcb;
}

td, 
th {
    border: 1px solid #cbcbcb;
    padding: 0.25rem .5rem;
}
!

JS
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999px

Console