Hi, I’m bold!

How to make my font bold using css?

I’m very new to HTML and CSS and I was just wondering how I could make my font bold using CSS. I have a plain HTML page that imports a CSS file, and I can change the font in the CSS. But I don’t know how to make the font bold, can anyone help me?

I suggest that you read the CSS2 specification, it gives a very thorough explanation of what you can do and how to do it. And it isn’t too dry, either. w3.org/TR/CSS2

10 Answers 10

You can use the CSS declaration font-weight: bold; .

I would advise you to read the CSS beginner guide at http://htmldog.com/guides/cssbeginner/ .

You can use the strong element in html, which is great semantically (also good for screen readers etc.), which typically renders as bold text:

See here, some emphasized text.

Or you can use the font-weight css property to style any element’s text as bold:

This is a paragraph of bold text.

I’ve put the whole 2nd paragraph in bold, so it’s not emphasising the words «bold text», it’s just style.

It’s only great semantically if you are trying to emphasize something; if it’s a style without trying to emphasize, the element is semantically misleading.

Do you want to make the entire document bold? Or just parts of it?

Sine you are new to html here are three ready to use examples on how to use CSS together with html. You can simply put them into a file, save it and open it up with the browser of your choice:

This one directly embeds your CSS style into your tags/elements. Generally this is not a very nice approach, because you should always separate the content/html from design.

       
Hi, I'm very bold!
   

The next one is a more general approach and works on all «p» (stands for paragraph) tags in your document and additionaly makes them HUGE. Btw. Google uses this approach on his search:

      p 
Hi, I'm very bold and HUGE!
   

You probably will take a couple of days playing around with the first examples, however here is the last one. In this you finally fully seperate design (css) and content (html) from each other in two different files. stackoverflow takes this approach.

In one file you put all the CSS (call it ‘hello_world.css’):

In another file you should put the html (call it ‘hello_world.html’):

       
Hi, I'm very bold and HUGE!
   

Hope this helps a little. To address specific elements in your document and not all tags you should make yourself familiar with the class , id and name attributes. Have fun!

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font-weight

The font-weight CSS property sets the weight (or boldness) of the font. The weights available depend on the font-family that is currently set.

Try it

Syntax

/* Keyword values */ font-weight: normal; font-weight: bold; /* Keyword values relative to the parent */ font-weight: lighter; font-weight: bolder; /* Numeric keyword values */ font-weight: 100; font-weight: 200; font-weight: 300; font-weight: 400; /* normal */ font-weight: 500; font-weight: 600; font-weight: 700; /* bold */ font-weight: 800; font-weight: 900; /* Global values */ font-weight: inherit; font-weight: initial; font-weight: revert; font-weight: revert-layer; font-weight: unset; 

The font-weight property is specified using any one of the values listed below.

Values

Normal font weight. Same as 400 .

Bold font weight. Same as 700 .

One relative font weight lighter than the parent element. Note that only four font weights are considered for relative weight calculation; see the Meaning of relative weights section below.

One relative font weight heavier than the parent element. Note that only four font weights are considered for relative weight calculation; see the Meaning of relative weights section below.

In earlier versions of the font-weight specification, the property accepts only keyword values and the numeric values 100, 200, 300, 400, 500, 600, 700, 800, and 900; non-variable fonts can only really make use of these set values, although fine-grained values (e.g. 451) will be translated to one of these values for non-variable fonts using the Fallback weights system.

CSS Fonts Level 4 extends the syntax to accept any number between 1 and 1000 and introduces Variable fonts, which can make use of this much finer-grained range of font weights.

Fallback weights

If the exact weight given is unavailable, then the following rule is used to determine the weight actually rendered:

• If the target weight given is between 400 and 500 inclusive:
  • Look for available weights between the target and 500 , in ascending order.
  • If no match is found, look for available weights less than the target, in descending order.
  • If no match is found, look for available weights greater than 500 , in ascending order.

  Meaning of relative weights

  When lighter or bolder is specified, the below chart shows how the absolute font weight of the element is determined.

  Note that when using relative weights, only four font weights are considered — thin (100), normal (400), bold (700), and heavy (900). If a font-family has more weights available, they are ignored for the purposes of relative weight calculation.

  Inherited value	bolder	lighter
  100	400	100
  200	400	100
  300	400	100
  400	700	100
  500	700	100
  600	900	400
  700	900	400
  800	900	700
  900	900	700

  Common weight name mapping

  The numerical values 100 to 900 roughly correspond to the following common weight names (see the OpenType specification):

  Value	Common weight name
  100	Thin (Hairline)
  200	Extra Light (Ultra Light)
  300	Light
  400	Normal (Regular)
  500	Medium
  600	Semi Bold (Demi Bold)
  700	Bold
  800	Extra Bold (Ultra Bold)
  900	Black (Heavy)
  950	Extra Black (Ultra Black)

  Variable fonts

  Most fonts have a particular weight which corresponds to one of the numbers in Common weight name mapping. However some fonts, called variable fonts, can support a range of weights with a more or less fine granularity, and this can give the designer a much closer degree of control over the chosen weight.

  For TrueType or OpenType variable fonts, the «wght» variation is used to implement varying widths.

  Note: For the example below to work, you’ll need a browser that supports the CSS Fonts Level 4 syntax in which font-weight can be any number between 1 and 1000 . The demo loads with font-weight: 500; . Change the value to see the weight of the text change.

  Accessibility concerns

  People experiencing low vision conditions may have difficulty reading text set with a font-weight value of 100 (Thin/Hairline) or 200 (Extra Light), especially if the font has a low contrast color ratio.

  Formal definition

  Initial value	normal
  Applies to	all elements. It also applies to ::first-letter and ::first-line .
  Inherited	yes
  Computed value	the keyword or the numerical value as specified, with bolder and lighter transformed to the real value
  Animation type	a font weight

  Formal syntax

  font-weight =
  |
  bolder |
  lighter

  =
  normal |
  bold |

  Examples

  Setting font weights

  HTML

  p> Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, "and what is the use of a book," thought Alice "without pictures or conversations?" p> div> I'm heavybr /> span>I'm lighterspan> div> 

  CSS

  /* Set paragraph text to be bold. */ p  font-weight: bold; > /* Set div text to two steps heavier than normal but less than a standard bold. */ div  font-weight: 600; > /* Set span text to be one step lighter than its parent. */ span  font-weight: lighter; > 

  Result

  Specifications

  Browser compatibility

  BCD tables only load in the browser

  See also

  Found a content problem with this page?

  This page was last modified on Jul 26, 2023 by MDN contributors.

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  Источник

  CSS font-weight Property

  The font-weight property sets how thick or thin characters in text should be displayed.

  Default value:	normal
  Inherited:	yes
  Animatable:	yes. Read about animatable Try it
  Version:	CSS1
  JavaScript syntax:	object.style.fontWeight=»bold» Try it

  Browser Support

  The numbers in the table specify the first browser version that fully supports the property.

  CSS Syntax

  Property Values

  Value	Description	Demo
  normal	Defines normal characters. This is default	Demo ❯
  bold	Defines thick characters	Demo ❯
  bolder	Defines thicker characters	Demo ❯
  lighter	Defines lighter characters	Demo ❯
  100 200 300 400 500 600 700 800 900	Defines from thin to thick characters. 400 is the same as normal, and 700 is the same as bold	Demo ❯
  initial	Sets this property to its default value. Read about initial
  inherit	Inherits this property from its parent element. Read about inherit

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