vf-masthead (masthead) is a full-width container that can take a text, theme colour, an image, and create a 'block' for the text to lay atop.
vf-masthead component can be used on the home page of group sites to help inform the visitor of the groups name, location, and additional information.
|Use this on the homepage of group sites||On every subsquent page|
|Use the title block with a theme colour||Use a title block, theme colour, and image|
By Default, the
vf-masthead is black text on a light grey background except if it is the title block variant where the text will be white on a black background with an overall light grey background.
This can be effected by either having a component specific class that effects the colours.
Theme Variants available are:
There is also a variant that allows for a background image -
vf-masthead--has-image as well as a variant that allows for the text to be in a block of white (with the text being black) -
If you are overriding the background or foreground (text) colour make sure you are:
- using a colour from the Visual Framework
- testing to be sure that the contrast ratio meets accessibility guidelines
Background Image Size
The maximum dimensions for a background image is 1224px wide with a height of 150px. As more and more displays are what we term 'retina' they need to be twice the width and height to look crisp.
Images that are used for mastheads need to have dimensions of 2448px by 300px.
When using a background image we have to determine the best text colour to meet the contrast ratio from our accessibility guidelines.
In choosing the image for masthead the image filename needs to have it's most dominate colour added as a hexadecimal code.
To find the dominant colour in the background image you can use a colour picker in graphics software to find the hex code.
This then allows the code to look for this hexidecimal colour code and mathematically works out the correct text colour to use. The CSS custom property
--local-theme-fg-color is then applied in the style tag of the component.
<style> <div class="vf-masthead vf-masthead--has-image" style="background-image: var(--vf-masthead__bg-image); --local-theme-fg-color:#FFFFFF;" data-vf-js-masthead > </style>
CSS Custom Properties do not work in older versions of Internet Explorer. We provide a default look for the masthead for these browser which is a white foreground colour (for text) on a green background.
However, this can be overriden if needed using the Sass variables.
This component is distributed with npm. After installing npm, you can install the
vf-masthead with this command.
$ yarn add --dev @visual-framework/vf-masthead
The source files included are written in Sass(
scss). You can point your Sass
include-path at your
node_modules directory and import it like this.
Make sure you import Sass requirements along with the modules. You can use a project boilerplate or the