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[css-images] Add basic syntax of repeating gradient types #8775

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Apr 27, 2023
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[css-images] Add basic syntax of repeating gradient types #8775

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22 changes: 14 additions & 8 deletions css-images-3/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -331,10 +331,10 @@ Linear Gradients: the ''linear-gradient()'' notation {#linear-gradients}
Its syntax is as follows:

<pre class=prod>
<<linear-gradient()>> = linear-gradient(
[ <<angle>> | to <<side-or-corner>> ]? ,
<<color-stop-list>>
)
<<linear-gradient()>> = linear-gradient( [ <<linear-gradient-syntax>> ] )

<dfn>&lt;linear-gradient-syntax></dfn> = [ <<angle>> | to <<side-or-corner>> ]? , <<color-stop-list>>

<dfn>&lt;side-or-corner></dfn> = [left | right] || [top | bottom]
</pre>

Expand Down Expand Up @@ -506,10 +506,11 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
The radial gradient syntax is:

<pre class=prod>
<<radial-gradient()>> = radial-gradient(
[ <<rg-ending-shape>> || <<rg-size>> ]? [ at <<position>> ]? ,
<<color-stop-list>>
)
<<radial-gradient()>> = radial-gradient( [ <radial-gradient-syntax> ] )

<dfn>&lt;radial-gradient-syntax></dfn> =
<<rg-ending-shape>> || <<rg-size>> ]? [ at <<position>> ]? ,
<<color-stop-list>>

<dfn>&lt;rg-size></dfn> = <<rg-extent-keyword>> | <<length [0,∞]>> | <<length-percentage [0,∞]>>{2}

Expand Down Expand Up @@ -770,6 +771,11 @@ Repeating Gradients: the ''repeating-linear-gradient()'' and ''repeating-radial-
and are interpreted the same
as their respective non-repeating siblings defined previously.

<pre class=prod>
<dfn>&lt;repeating-linear-gradient()></dfn> = repeating-linear-gradient( [ <<linear-gradient-syntax>> ] )
<dfn>&lt;repeating-radial-gradient()></dfn> = repeating-radial-gradient( [ <<radial-gradient-syntax>> ] )
</pre>

When rendered, however, the color-stops are repeated infinitely in both directions,
with their positions shifted by multiples of the difference between
the last specified color-stop's position
Expand Down
20 changes: 12 additions & 8 deletions css-images-4/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1197,10 +1197,9 @@ Linear Gradients: the ''linear-gradient()'' notation {#linear-gradients}
See [[css-color-4#interpolation]].

<pre class=prod>
<dfn>linear-gradient()</dfn> = linear-gradient(
<dfn>&lt;linear-gradient-syntax></dfn> =
[ [ <<angle>> | to <<side-or-corner>> ] || <<color-interpolation-method>> ]? ,
<<color-stop-list>>
)
<dfn>&lt;side-or-corner></dfn> = [left | right] || [top | bottom]
</pre>

Expand Down Expand Up @@ -1343,10 +1342,9 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
See [[css-color-4#interpolation]].

<pre class=prod>
<dfn>radial-gradient()</dfn> = radial-gradient(
[ [ [ <<rg-ending-shape>> || <<rg-size>> ]? [ at <<position>> ]? ] || <<color-interpolation-method>>]? ,
<<color-stop-list>>
)
<dfn>&lt;radial-gradient-syntax></dfn> =
[ [ [ <<rg-ending-shape>> || <<rg-size>> ]? [ at <<position>> ]? ] || <<color-interpolation-method>>]? ,
<<color-stop-list>>
</pre>

<div class="example">
Expand Down Expand Up @@ -1422,10 +1420,10 @@ Conic Gradients: the ''conic-gradient()'' notation</h3>
The syntax for a conic gradient is:

<pre class='prod'>
<dfn>conic-gradient()</dfn> = conic-gradient(
<dfn>conic-gradient()</dfn> = conic-gradient( [ <<conic-gradient-syntax>> ] )
<dfn>&lt;conic-gradient-syntax></dfn> =
[ [ [ from <<angle>> ]? [ at <<position>> ]? ] || <<color-interpolation-method>> ]? ,
<<angular-color-stop-list>>
)
</pre>

The arguments are defined as follows:
Expand Down Expand Up @@ -1583,6 +1581,12 @@ Repeating Gradients: the ''repeating-linear-gradient()'', ''repeating-radial-gra
and are interpreted the same
as their respective non-repeating siblings defined previously.

<pre class=prod>
<dfn>&lt;repeating-conic-gradient()></dfn> = repeating-conic-gradient( [ <<conic-gradient-syntax>> ] )
<dfn>&lt;repeating-linear-gradient()></dfn> = repeating-linear-gradient( [ <<linear-gradient-syntax>> ] )
<dfn>&lt;repeating-radial-gradient()></dfn> = repeating-radial-gradient( [ <<radial-gradient-syntax>> ] )
</pre>

<div class=example>
Basic repeating conic gradient:

Expand Down