difference between width auto and width 100 percent

Width auto

The initial width of a block level element like div or p is auto. This makes it expand to occupy all available horizontal space within its containing block. If it has any horizontal padding or border, the widths of those do not add to the total width of the element.

Width 100%

On the other hand, if you specify width:100%, the element’s total width will be 100% of its containing block plus any horizontal margin, padding and border (unless you’ve used box-sizing:border-box, in which case only margins are added to the 100% to change how its total width is calculated). This may be what you want, but most likely it isn’t.

To visualise the difference see this picture:

Source

Related Posts:

  1. Open source social media icons to download and use on website? [closed]
  2. CSS calc width and height values
  3. Center image using text-align center?
  4. CSS Background Opacity [duplicate]
  5. How do I vertically align text in a div?
  6. Hide scroll bar, but while still being able to scroll
  7. How can I center text (horizontally and vertically) inside a div block?
  8. Center image horizontally within a div
  9. Draw Circle using css alone [duplicate]
  10. Remove CSS class from element with JavaScript (no jQuery) [duplicate]
  11. Transparent CSS background color
  12. Prevent line-break of span element
  13. Is there any way to change input type=”date” format?
  14. How to align iframe always in the center
  15. How to center a “position: absolute” element
  16. Expected RBRACE, but the bracket is there?
  17. How to make an image center (vertically & horizontally) inside a bigger div
  18. How to center text with Markdown?
  19. Set the table column width constant regardless of the amount of text in its cells?
  20. Two divs side by side – Fluid display
  21. CSS Display an Image Resized and Cropped
  22. Disable Scrolling on Body
  23. Darken CSS background image?
  24. How do I make a placeholder for a ‘select’ box?
  25. FontAwesome icons are not showing, Why?
  26. Responsive image map
  27. CSS color vs. background-color vs. background?
  28. How to wrap text around an image using HTML/CSS
  29. Getting “Failed to load resource: net::ERR_FILE_NOT_FOUND” when trying to load a background image
  30. CSS: background-color only inside the margin
  31. Stretch background image css?
  32. Set cellpadding and cellspacing in CSS?
  33. How to make a whole ‘div’ clickable in html and css without JavaScript?
  34. How (and why) to use display: table-cell (CSS)
  35. Vertical Text Direction
  36. Disable Scrolling on Body
  37. CSS Background Image Not Displaying
  38. How to darken a CSS background image?
  39. Changing image sizes proportionally using CSS
  40. How can I create a marquee effect?
  41. How to give the background-image path in CSS?
  42. How to overlay image with color in CSS?
  43. CSS Background image not loading
  44. Outline radius?
  45. text-overflow: ellipsis not working
  46. How to set Helvetica font?
  47. right align an image using CSS HTML
  48. Indent starting from the second line of a paragraph with CSS
  49. CSS Background Image Not Displaying
  50. CSS list-style-image size
  51. html not linking css
  52. Removing border from table cells
  53. How to display hr horizontally with flex?
  54. Why doesn’t height: 100% work to expand divs to the screen height?
  55. How can I position my div at the bottom of its container?
  56. Why doesn’t height: 100% work to expand divs to the screen height?
  57. How can I position my div at the bottom of its container?
  58. How can I override Bootstrap CSS styles?
  59. How to overlay one div over another div
  60. How to get CSS to select ID that begins with a string (not in Javascript)?
  61. Styling an input type=”file” button
  62. How to stick footer to bottom (not fixed) even with scrolling
  63. Setting table row height
  64. How do I disable the resizable property of a textarea?
  65. Is it possible to set the equivalent of a src attribute of an img tag in CSS?
  66. Place input box at the center of div
  67. How to display a gif fullscreen for a webpage background?
  68. Padding a table row
  69. Fit background image to div
  70. Table scroll with HTML and CSS
  71. Set cellpadding and cellspacing in CSS?
  72. how to do a line break in Bootstrap 3.3.7
  73. How to align 3 divs (left/center/right) inside another div?
  74. Vertical align not working on inline-block
  75. Align an element to bottom with flexbox
  76. How can I change the thickness of my
    tag
  77. Is it possible to put CSS @media rules inline?
  78. Make padding responsive
  79. Vertically align text next to an image?
  80. How to create spoiler text?
  81. How do I center text in a span?
  82. text-align justify not working
  83. HTML not loading CSS file
  84. How can I center my ul li list in css?
  85. Is it possible to use css to shrink text to automatically fit the size of the div
  86. CSS !important not working
  87. Best way to center a
  88. How to best set a CSS3 transition to none?
  89. How to make a div 100% height of the browser window
  90. How to resize an image to fit in the browser window?
  91. Why is vertical-align: middle not working on my span or div?
  92. ow to change the style of the title attribute inside an anchor tag?
  93. Flex align-items: center not centering items
  94. HTML / CSS table with GRIDLINES
  95. Layout a flex box similar to a table?
  96. jQuery find element by data attribute value
  97. How do I clear the content of a div using JavaScript?
  98. Style reply form different than comment form
  99. Style the last element having a specific class [closed]
  100. How can I insert a disclaimer in a WordPress site?

Leave a Comment