1. <blockquote id="ntfnr"></blockquote>
        <thead id="ntfnr"></thead>
        190
        191
        192
        193Header<\/div>
        194
        195
        196
        197<\/div>
        198
        199

        200
        201

        Analysis: <\/strong><\/p>
        202
        203

        The outermost wrapper nests all the content inside, and the overall positioning is relative. max min already controls the narrowest and widest values ??very well, but it has no effect on IE. If there are no other layouts interspersed, this layer can actually be written in the body, eliminating one layer of nesting. <\/p>
        204
        205

        #wrapper{ width:auto; border:1px solid #000; min-width:776px; max-width:1000px; text- align:left; margin-left:auto; margin-right:auto; position:relative;}<\/p>
        206
        207

        <\/p>
        208
        209< ;p>wrapper's lower-level outer header footer<\/font><\/p>
        210
        211

        The header is positioned absolutely and the footer is positioned relative; the outer is positioned on the left and right respectively There are 130px margins, which is key to compatibility with non-IE. <\/p>
        212
        213

        #outer{ margin-left:130px; margin-right:130px; background:silver; border-left:1px solid #000; border-right :1px solid #000; color: #000;}

        214
        215#header{ position:absolute; top:0; left:0; width:100%; height:70px; line-height:70px; border-bottom:1px solid #000; overflow:hidden; background:#0ff; text-align:center; font-size:xx-large}

        216
        217#footer { width:100%; clear:both; line-height:50px; border-top:1px solid #000; background:#ffc; color:#000; text-align:center; position:relative;} <\/p>
        218
        219

        outer lower-level clearheader outerwrap right clearer<\/font><\/p>
        220
        221
        222
        223outerwrap Why is the width 99% instead of 100%?

        224
        225 Because its upper outer layer has a border, 100% width plus 2 border pixels will make it bigger, and FF has obvious effects.

        226
        227right's processing is very classic. It is resolved to positioning under IE and floating under FF. The processing of negative margins also just uses the space left by the upper outer. <\/p>
        228
        229

        #clearheader{ height:72px;}

        230
        231.outerwrap { float:left; width: 99%;}

        232
        233#right {

        234
        235position:relative;

        236
        237width:130px; float:right; left:1px;

        238
        239margin-right:-129px;

        240
        241}< br \/>
        242
        243* html #right { margin-right:-130px; margin-left:-3px}

        244
        245.clearer{ height: 1px; overflow:hidden; margin-top:-1px; clear:both;}<\/p>
        246
        247

        The idea of ??centrecontent left clearer in outerwrap is similar to the above. <\/p>
        248
        249

        Specifies that browsers of IE5.0 and above are valid<\/font><\/p> >251

        Use the expression method to control the width condition of IE5.0 and above, and automatically adjust the width and center it. I fixed the width value because if you use auto here, the div content will not be displayed during the window resizing process. <\/p>
        252
        253

        body {

        254
        255width:expression( documentElement.clientWidth <= 800 ? (documentElement.clientWidth == 0 ? (body.clientWidth <= 800 ? \"776\" : \"1000\") : \"776px\") : \"1000\" );

        256
        257}

        258
        259#wrapper {

        260
        261width:expression( documentElement.clientWidth <= 800 ? (documentElement.clientWidth == 0 ? (body.clientWidth <= 800 ? \"776\" : \"1000\") : \"776px\") : \"1000\" );< br \/>
        262
        263}<\/p>
        264
        265

        This example combines many classic usages and definitions of DIV CSS, and is very traditional and practical at the same time . <\/p>
        266
        267<\/div>
        268
        269

        <\/div>
        270
        271
        <\/div>
        272
        273<\/div>
        274
        275
        Footer<\/div>
        276
        277<\/div>
        278
        279<\/body>
        280
        281<\/html>
        282 <\/p>

        <\/p> "}

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        Home Web Front-end HTML Tutorial DIV CSS classic layout [width adaptive] [automatic screen centering]_html/css_WEB-ITnose

        DIV CSS classic layout [width adaptive] [automatic screen centering]_html/css_WEB-ITnose

        Jun 24, 2016 pm 12:29 PM

        Header

        Analysis:

        The outermost wrapper nests all the content inside, and the overall positioning is relative . max min already controls the narrowest and widest values ??very well, but it has no effect on IE. If there are no other layouts interspersed, this layer can actually be written in the body, eliminating one layer of nesting.

        #wrapper{ width:auto; border:1px solid #000; min-width:776px; max-width:1000px; text-align:left; margin-left:auto; margin-right:auto; position:relative;}

        wrapper’s lower-level outer header footer

        The header is positioned absolutely and the footer is positioned relative; the outer has 130px margins on the left and right respectively. This is Key to compatibility with non-IE.

        #outer{ margin-left:130px; margin-right:130px; background:silver; border-left:1px solid #000; border-right:1px solid #000; color: #000;}
        #header{ position:absolute; top:0; left:0; width:100%; height:70px; line-height:70px; border-bottom:1px solid #000; overflow:hidden; background:#0ff; text-align:center; font-size:xx-large}
        #footer { width:100%; clear:both; line-height:50px; border-top:1px solid #000; background:#ffc; color :#000; text-align:center; position:relative;}

        outer lower-level clearheader outerwrap right clearer

        clearheader is used to fill in the blanks of the header. Clearer is a commonly used filling hack. .
        Why is outerwrap width 99% instead of 100%?
        Because its upper outer layer has a border, adding 2 border pixels to 100% width will stretch it, and FF has obvious effects.
        The processing of right is very classic. It is resolved as positioning under IE and as floating under FF. The processing of negative margins also just uses the space left by the upper outer.

        #clearheader{ height:72px;}
        .outerwrap { float:left; width:99%;}
        #right {
        position:relative;
        width:130px; float:right; left:1px;
        margin-right:-129px;
        }
        * html #right { margin-right:-130px; margin-left:-3px}
        .clearer{ height:1px; overflow:hidden; margin-top:-1px; clear:both;}

        The idea of ??centercontent left clearer in outerwrap is similar to the above.

        Specify that browsers of IE5.0 and above are valid

        Use the expression method to control the width condition of IE5.0 and above, and realize automatic width adjustment and centering. I fixed the width value because if you use auto here, the div content will not be displayed during the window resizing process.

        body {
        width:expression( documentElement.clientWidth <= 800 ? (documentElement.clientWidth == 0 ? (body.clientWidth <= 800 ? "776" : "1000") : " 776px") : "1000" );
        }
        #wrapper {
        width:expression( documentElement.clientWidth <= 800 ? (documentElement.clientWidth == 0 ? (body.clientWidth <= 800 ? "776" : "1000") : "776px") : "1000" );
        }

        This example combines many classic usages and definitions of DIV CSS, and is very traditional and practical at the same time.

        Footer

        Code
        ??1
        ??2
        ??3
        ??4
        ??5
        ??6
        ??7
        ??8
        ??9test
        ?10
        ?11
        ?12
        ?13
        ?14
        ?15
        182
        183-->
        184
        185
        186
        187
        188
        189
        190
        191


        192
        193
        194
        195

        196
        197

        198
        199

        200
        201

        Analysis:


        202
        203

        The outermost wrapper nests all the content inside, and the overall positioning is relative. max min already controls the narrowest and widest values ??very well, but it has no effect on IE. If there are no other layouts interspersed, this layer can actually be written in the body, eliminating one layer of nesting.


        204
        205

        #wrapper{ width:auto; border:1px solid #000; min-width:776px; max-width:1000px; text- align:left; margin-left:auto; margin-right:auto; position:relative;}


        206
        207


        208
        209< ;p>wrapper's lower-level outer header footer


        210
        211

        The header is positioned absolutely and the footer is positioned relative; the outer is positioned on the left and right respectively There are 130px margins, which is key to compatibility with non-IE.


        212
        213

        #outer{ margin-left:130px; margin-right:130px; background:silver; border-left:1px solid #000; border-right :1px solid #000; color: #000;}

        214
        215#header{ position:absolute; top:0; left:0; width:100%; height:70px; line-height:70px; border-bottom:1px solid #000; overflow:hidden; background:#0ff; text-align:center; font-size:xx-large}

        216
        217#footer { width:100%; clear:both; line-height:50px; border-top:1px solid #000; background:#ffc; color:#000; text-align:center; position:relative;}


        218
        219

        outer lower-level clearheader outerwrap right clearer


        220
        221
        222
        223outerwrap Why is the width 99% instead of 100%?

        224
        225 Because its upper outer layer has a border, 100% width plus 2 border pixels will make it bigger, and FF has obvious effects.

        226
        227right's processing is very classic. It is resolved to positioning under IE and floating under FF. The processing of negative margins also just uses the space left by the upper outer.


        228
        229

        #clearheader{ height:72px;}

        230
        231.outerwrap { float:left; width: 99%;}

        232
        233#right {

        234
        235position:relative;

        236
        237width:130px; float:right; left:1px;

        238
        239margin-right:-129px;

        240
        241}< br />
        242
        243* html #right { margin-right:-130px; margin-left:-3px}

        244
        245.clearer{ height: 1px; overflow:hidden; margin-top:-1px; clear:both;}


        246
        247

        The idea of ??centrecontent left clearer in outerwrap is similar to the above.


        248
        249

        Specifies that browsers of IE5.0 and above are valid

        >251

        Use the expression method to control the width condition of IE5.0 and above, and automatically adjust the width and center it. I fixed the width value because if you use auto here, the div content will not be displayed during the window resizing process.


        252
        253

        body {

        254
        255width:expression( documentElement.clientWidth <= 800 ? (documentElement.clientWidth == 0 ? (body.clientWidth <= 800 ? "776" : "1000") : "776px") : "1000" );

        256
        257}

        258
        259#wrapper {

        260
        261width:expression( documentElement.clientWidth <= 800 ? (documentElement.clientWidth == 0 ? (body.clientWidth <= 800 ? "776" : "1000") : "776px") : "1000" );< br />
        262
        263}


        264
        265

        This example combines many classic usages and definitions of DIV CSS, and is very traditional and practical at the same time .


        266
        267

        268
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        270
        271

        272
        273

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