HTML basics (5)-css style sheet style attribute format and layout
Jul 11, 2016 am 08:43 AM1. position: fixed
Lock position (position relative to the browser), such as the pop-up window in the lower right corner of some websites.
Example:
2. position: absolute
Absolute position:
1. The outer layer does not have position: absolute (or relative); then the div is positioned relative to the browser, as shown in b (50 pixels from the right border of the browser and 20 pixels from the bottom border).
2. The outer layer has position: absolute (or relative); then the div is positioned relative to the outer border, as shown in the picture below (50 pixels from the right border of d, 20 pixels from the lower border of d).
Example:
3. position: relative
Relative position:
As shown below, it is fixed relative to a certain position of the div that contains this div. If the outer layer does not contain it, the relative position is fixed relative to the browser.
Example:
4. Layering (z-index)
is layered in the direction of the z axis, which can be understood as being divided into a pile of paper, with the higher the number of layers, the higher they are.
In the relative example above, we see that aa covers aa. This is because the display level of the code written later is higher. So how can a cover aa without changing the code order. As follows:
Example:
5. float: left, right
There is no need to specify the position for him when Left, right (left, top), directly relative to the browser. If the outer part is wrapped, the upper left or upper right position of the outer div will be displayed except for one line.
Additional: 1. overflow: hidden; //Hide the excess part; scroll, display the scroll bar;
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2. cursor: pointer The shape when the mouse points to it;3. Translucent effect:
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The code in the style sheet is:
.box
?????????????? {
opacity:0.5; -moz-opacity:0.5 ; filter:alpha(opacity=50)
?????????}
To sum up the above practice examples: Make part of the format layout of the drug tyrant website list
html code:


<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><!</span><span style="color: #ff00ff;">DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">html </span><span style="color: #ff0000;">xmlns</span><span style="color: #0000ff;">="http://www.w3.org/1999/xhtml"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 4</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">http-equiv</span><span style="color: #0000ff;">="Content-Type"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="text/html; charset=utf-8"</span> <span style="color: #0000ff;">/></span> <span style="color: #008080;"> 5</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>無標(biāo)題文檔<span style="color: #0000ff;"></</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 6</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">style </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/css"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 7</span> <span style="background-color: #f5f5f5; color: #800000;">.a </span><span style="color: #008080;"> 8</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 9</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 10</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1000px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 11</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">100px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 12</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 13</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">150px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 14</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">80px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 15</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 16</span> <span style="background-color: #f5f5f5; color: #800000;">.b </span><span style="color: #008080;"> 17</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 18</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 19</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">240px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 20</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 21</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 22</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">150px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 23</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 24</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 25</span> <span style="background-color: #f5f5f5; color: #800000;">.c </span><span style="color: #008080;"> 26</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 27</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 28</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">740px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 29</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">300px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 30</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 31</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">410px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 32</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 33</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 34</span> <span style="background-color: #f5f5f5; color: #800000;">.d </span><span style="color: #008080;"> 35</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 36</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 37</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">740px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 38</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 39</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 40</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">410px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 41</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">520px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 42</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 43</span> <span style="background-color: #f5f5f5; color: #800000;">.e </span><span style="color: #008080;"> 44</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 45</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 46</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">240px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 47</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1500px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 48</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 49</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">150px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 50</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">420px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 51</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 52</span> <span style="background-color: #f5f5f5; color: #800000;">.f </span><span style="color: #008080;"> 53</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 54</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 55</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">240px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 56</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">150px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 57</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 58</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">150px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 59</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1940px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 60</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 61</span> <span style="background-color: #f5f5f5; color: #800000;">.g </span><span style="color: #008080;"> 62</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 63</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 64</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">740px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 65</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1350px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 66</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 67</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">410px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 68</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">740px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 69</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 70</span> <span style="background-color: #f5f5f5; color: #800000;">.h </span><span style="color: #008080;"> 71</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 72</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 73</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1000px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 74</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 75</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 76</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">150px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 77</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">2110px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 78</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;"> 79</span> <span style="background-color: #f5f5f5; color: #800000;">.i </span><span style="color: #008080;"> 80</span> <span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 81</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px solid blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 82</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1000px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 83</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;"> 84</span> <span style="background-color: #f5f5f5; 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ARIA's role attribute is used to define the role of web elements and improve accessibility. 1. Role attribute helps assistive technology to understand the functions of elements, such as buttons, navigation, etc. 2. Use role attributes to assign specific roles to non-semantic HTML elements. 3. The role attribute should be consistent with the element behavior and be verified by the accessibility tool test.

How to create a website layout? 1. Use HTML tags to define the content structure, such as, ,. 2. Control styles and positions through CSS, using box model, float or Flexbox layout. 3. Optimize performance, reduce HTTP requests, use cache and optimize images, and ensure responsive design.

Improve the readability and maintainability of HTML code can be achieved through the following steps: 1. Use semantic tags, such as, etc. to make the code structure clear and improve SEO effect; 2. Keep the code formatted and use consistent indentation and spaces; 3. Add appropriate comments to explain the code intention; 4. Avoid excessive nesting and simplify the structure; 5. Use external style sheets and scripts to keep the HTML concise.

The key to keep up with HTML standards and best practices is to do it intentionally rather than follow it blindly. First, follow the summary or update logs of official sources such as WHATWG and W3C, understand new tags (such as) and attributes, and use them as references to solve difficult problems; second, subscribe to trusted web development newsletters and blogs, spend 10-15 minutes a week to browse updates, focus on actual use cases rather than just collecting articles; second, use developer tools and linters such as HTMLHint to optimize the code structure through instant feedback; finally, interact with the developer community, share experiences and learn other people's practical skills, so as to continuously improve HTML skills.

The reason for using tags is to improve the semantic structure and accessibility of web pages, make it easier for screen readers and search engines to understand page content, and allow users to quickly jump to core content. Here are the key points: 1. Each page should contain only one element; 2. It should not include content that is repeated across pages (such as sidebars or footers); 3. It can be used in conjunction with ARIA properties to enhance accessibility. Usually located after and before, it is used to wrap unique page content, such as articles, forms or product details, and should be avoided in, or in; to improve accessibility, aria-labeledby or aria-label can be used to clearly identify parts.

To create a basic HTML document, you first need to understand its basic structure and write code in a standard format. 1. Use the declaration document type at the beginning; 2. Use the tag to wrap the entire content; 3. Include and two main parts in it, which are used to store metadata such as titles, style sheet links, etc., and include user-visible content such as titles, paragraphs, pictures and links; 4. Save the file in .html format and open the viewing effect in the browser; 5. Then you can gradually add more elements to enrich the page content. Follow these steps to quickly build a basic web page.

HTMLtagsareessentialforstructuringwebpages.Theydefinecontentandlayoutusinganglebrackets,ofteninpairslikeand,withsomebeingself-closinglike.HTMLtagsarecrucialforcreatingstructured,accessible,andSEO-friendlywebpages.

To create an HTML checkbox, use the type attribute to set the element of the checkbox. 1. The basic structure includes id, name and label tags to ensure that clicking text can switch options; 2. Multiple related check boxes should use the same name but different values, and wrap them with fieldset to improve accessibility; 3. Hide native controls when customizing styles and use CSS to design alternative elements while maintaining the complete functions; 4. Ensure availability, pair labels, support keyboard navigation, and avoid relying on only visual prompts. The above steps can help developers correctly implement checkbox components that have both functional and aesthetics.
