The document discusses various techniques for front-end optimization including minification, gluing CSS and JavaScript files together, image encoding, and caching. Minification removes unnecessary characters to reduce file sizes. Gluing combines related files to reduce HTTP requests. Encoding uses gzip/deflate compression to make files smaller. Caching utilizes HTTP headers to leverage browser and proxy caching for optimized loading.
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5. @media screen { html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, /* Bad tags ^_~ */ dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td { padding: 0; margin: 0 } h1,h2,h3,h4,h5,h6 { font-weight: normal } a img { border: 0 } ul { list-style-type: none } }